Underdog 

1) A cartoon from the 1960s and 1970s involving a super-hero dog.

2) An elite (31337) player in Counter Strike. a.k.a. Underdog.

1) Underdog is the MAN! (Dog)

2) Underdog killed n00btard with AWP

Underdog by Chafie K. May 6, 2003

Underdog 

To go under the blankets and eat out a girls ass

I was giving her an underdog, then she turned it into a dump truck.

Underdog by Seanathan June 12, 2008

Underdog 

A man sits on a woman's face and she licks the underside of his penis.

Jacquella, I'm really jonesing for an underdog.

Underdog by Captain Stooben May 9, 2010

Underdog 

To superman a girl in a bathroom with toilet paper.

I underdogged that chick at the bar the other night, and since she was wearing a spaghetti strap everyone could see her cape when she came out of the bathroom.

Underdog by Superman Dat Hoe January 8, 2008

underdog 

when you take your boner and you tuck it between your legs so it sticks out and you masterbate

hey MOTT what are you doing^
underdogging!!
sweet me tooooo....

underdog by jon demers June 2, 2007

underdog 

A boy/girl who is good enough to hook up with but you would never make your boyfriend/girlfriend.

-You just hook up and never actually get to know the poor thing. And if it ever wanted to get to know you, you wouldn't give it a chance because it's the underdog.

underdog: that hook up was amazing, wanna date me?
trainer: uh.. no. i just like making out with you.
(the trainer would not date the underdog because for whatever reason the underdog is not bf/gf material. but it is acceptable to make out with it.)

underdog by underdogtrainer. April 2, 2011

underdog 

when you get a boner and tuck it between your legs so it sticks out the bottom then you masterbate

hey vijay what you doing tonight´...
underdogging it ofcourse
ahh sweet me too

underdog by jon demurs June 1, 2007