1.    You play guitar without a shirt on.

2.    You make the peace sign backwards; i.e. showing the back of your fingers instead of the palm side. (Especially if this is your only and automatic photo pose.)

3.    You keep your rat of a dog in a purse, especially if the bag is designer.

4.    You shaved a slit into your eyebrow.

5.    You tuck your pants into your socks.

6.    You’re nickname has the word ‘rod’ in it. E.g. ‘A-Rod’

7.    You think anyone who’s smart, hip, or fashionable, or in any way threatens you is ‘gay’, or a ‘fag’.

8.    You think chauvinism and acting macho are awesome, as you brag to your lame friends about the girls you’ve ‘banged’.

9.    You’ve tanning-bedded yourself into a ‘Leather Face’ from Texas Chainsaw Massacre.

10.    You walk around with thongs calling them sandals, and they make that clacking sound.

11.    You’ve worn shell necklaces, aviators, a pastel polo, and golf shorts all that the same time.

12.    You only watch UFC, or you still watch wrestling.

13.    You started smoking in the last 10-20 years. Smoking hasn’t been cool since Arthur Fonzarelli.

14.    You’ve written things in a public bathroom.

15.    You‘ve been called a ‘wigger’.

16.    You greet people by saying ‘sup’, or end conversations with ‘peace’. OR You use stupid abbreviations, ‘def, poss, hella-, etc.’

17.    You think dog-fighting is cool. (Or any other form of animal cruelty for that matter)

18.    You think having bottle service in a bar makes you a god among men, or you brag about the time you drank ‘Cristal’.

19.    Your car makes more exhaust noise than a rototiller on concrete—especially if it’s a Honda Civic.

20.     You make lists explaining how other people are Douchebags.

-Gerald A. Dinkel (He just says things.)

http://sardonicconnection.blogspot.com/2009/09/95-how-to-tell-if-youre-douchebag.html