1. To be under a dog.
Person A: (Gets under his dog) Look everyone! I am an underdog.
by Kaycikay October 25, 2006
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The act of finger banging a girl whilst wearing a Sweep hand puppet
Last night I underdogged the girlfriend. Now Sweep has a wet nose so I will use Sooty next time
by Trapper Hart June 12, 2021
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What TJ Kippen calls his crush
TJ : hey you look cute underdog
Cyrus : ???
TJ : no homo though
by I*Made*This*Account*For*A*Meme January 23, 2019
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When someone or something that's expected to lose, but later, they became the winner.
"I didn't expect that the other team won, they had only 2 points, what an underdog!"
"The red side was out numbered and think they were going to lose, but somehow, the blue team caught up and win the battle! They're the underdog!"
by defs4u May 6, 2009
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A hot dog hidden under the hot dog and bun a person buys from a convenient store.
Pedro: Man, are you sure you don't want two hot dogs?

Trey: Nah, bro. I got that underdog.
by MeatLoafLvr January 11, 2009
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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
by Chafie K. May 7, 2003
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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.
by Seanathan June 12, 2008
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