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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someone who rises to the top and proves everyone wrong but in the beginning gets no attentions or hint of their goal is being done or sum..
sasuke is a underdog thought the show Naruto.

Naruto isn't the underdog....this is just a joke peeps dont get tight
by justwantmesomewaffles January 25, 2018
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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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the competitor who is at a disadvantage or picked to lose the competition
They are the underdog's in the superbowl
by Kevin M. M November 30, 2006
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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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