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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
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2
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
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4
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
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5
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
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6
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
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Noun: A sexual act typically performed during three way sex where the female is receiving vaginal or anal sex on all fours (doggy style) while the third party lies underneath and licks or otherwise performs oral sex on the female and possibly the male concurrent with their intercourse. The third party may be either female or male.

Verb: To perform oral sex on a female and possibly also the male while they are having intercourse (fucking).
Bro, I was banging Kristen last night and Linda underdogged us. It felt like getting pussy and head at the same time.
by Mikey607 February 17, 2013
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