See attached link first to understand the basic definition.
So, that’s what’s up with me right now… total douchebaggery. Not on my end of course… I’m always a complete angel. Well, not always 
. But I’ve been single for how long… less than a year? and I’m already sick of guys. It’s all stupid bullshit games. Oh, I like you, I’ve had a crush on you forever, your personality is just so intimidating, I’ve always thought you were cute… and then it changes to… I’ve got my own problems I’m dealing with now, it’s not you, yada, yada, yada. Listen dude, don’t give me crap lines, when I said let’s just be friends I meant, let’s just be friends, not I would like to get in a serious relationship. When did “Do you wanna grab some pizza?” turn into “Do you wanna settle down and start a goddamn family.” Refreakindiculous.
Anyway… you might be commiting douchebagery if:
Appearance:
you have fake baked within the last few months/years/ever
you have one earring… possibly with bling
you can’t leave the house w/out dousing your body in Bod or Polo Sport
you wear a white college hat (like one that says Cocks)
you wear a visor
you wear an “outfit” that matches head to toe… like all Adidas
you use enough gel to need a new bottle on a bi-weekly basis
you have a tongue ring/nipple piercings/Prince Albert
you have a tatoo of barbed wire/tribal symbols/a confederate flag/asian characters
you have worn a wifebeater out in public when heading anyplace other than the gym
you wear a pinky ring or any ring that has bling or is connected between fingers, or you are still rocking you high school/college ring
you wear a thick chain in either silver or gold with a big cross (when you haven’t been to church in years),or with your high school football number or just any charm in general
you have worn a puka shell necklace in the past 3 years and have never been on a surfboard or lived on the beach
you have worn a moustache when in reality you are incapable of growing more than a few sad hairs at one time… we call this a “ratstache”
you are still wearing a trucker hat with the mesh in the back
you cant tie your own tie
Vehicle:
you drive a Camaro/Firebird/muscle car/Japanese sportcar/truck either lowered or with a lift
you have a wing on the back of your car
you have neon lights under/anywhere on your car
you have spinners
you have an exhaust pipe enlargement
you have any of the following stickers on your car… a flag of a country you were not born in/a saying in a foreign language you don’t speak/Calvin pissing on anything/a hunting or fishing sticker
you have anything airbrushed on your front license plate
you ride a crotchrocket… especiacially if your clothes and helmet match
Personality:
you own on DVD/have a poster of Scarface/the Godfather/Rambo/Rocky
you have worked as a male stripper
you have gotten in a fight with a random stranger in public after the age of 19
you have done a keg stand/shotgunned/funnelled a beer after the age of 25
things I consider to be personal acts of douchebaggery which may not be offensive to all women:
-talking about liking “curvy” women when in reality you only ever check out/talk about skinny bitches
-talking about other women you think are hot in front of me in general
-going hot and cold in how you feel about someone… either you like them as a person or you don’t… don’t waste my time
-claiming you like when a girl is aggressive and goes after what she wants and then freaking out when she actually does
-saying that you like my sarcasm and then not being able to deal with my biting sense of humor
-saying you like a smart woman and then being intimidated by her brain
-giving some bullshit excuse/no excuse at all for not hanging out when asked to do something
-only acknowledging a girls presence when you think you might get some… and the rest of the time just pretending she doesn’t exist, dude I figured it out… and maybe I’m just using you