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.)
by underdogtrainer. March 16, 2011
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One that is expected to lose a contest or struggle

One that is at a disadvantage.
Dude 1 : Do you think that man who is 3ft 40lbs can beat up Mike Tyson ?

Guy 2: Hell no you dumbass. That midget's got his legs cut off and he's blind in one eye. He's a real underdog if I ever saw one.

Dude 1: Why don't you just goto hell.

Guy 2: God you're a bitch...
by Jarba January 12, 2006
Someone who is hardly noticed. Kind of the opposite of popular or the best, but not exactly the worst.
Paris: Who are you rooting for, sexy?
Holden: I'm rooting for the underdog because I can relate to them.
by Pepperidge May 15, 2005
A person that is a hard worker at what he/she does.These people are the future champions or Bo$$e$ of the world.

"Train like an underdog, win like a champion" -Rockafella Family
" That kid was in the dark. He was a true underdog. Now look at him, he's the Bo$$."
by The Bo$$ March 15, 2005
When a female wears a skirt with no under garments and sits on a male's lap and the male opens his fly and sticks his erect penis into her juiced up vagina. Making it look very casual to the naked eye.
Damn yo, it looked like Mary and Chase were doing the under dog at the local Starbucks/Safeway area.
by Hot chicky September 20, 2008
60's cartoon of a superdog. Always spoke in rhymes. Constantly had to save his loved Polly Purebread from archenemy Simon Barr Sinister.
Person 1:Look, in the sky, it's a bird
Person 2:It's a Plane
Person 3:It's a frog......
Person 1&2:A frog?

Underdog: Nor bird, nor plane, nor even frog......just little ole me ....UNDERDOG!!! HIP HIP AND AWAY!!
by Ryan August 01, 2004
To push someone on a swing whilst going under them.
Dad gave Chris an underdog!
by Chris June 13, 2004
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