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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Maybe the underdog I know is based on the underdog from the 60's, but the one I'm familliar with was on Nickelodeon, and also spoke in rhymes. He was a cartoon dog, and I think he had a cape.
"There's no need to fear! Underdog is here!" - phrase from virtually every preview/ad for the show.
by bandcampgirl183 September 16, 2005
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The person (usually male during gay sex) who is receiving whilst in the doggy position.
Me and Fred had sex last night. I normally give so it was a change to be the underdog.
by j_graham June 9, 2011
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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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A man sits on a woman's face and she licks the underside of his penis.
Jacquella, I'm really jonesing for an underdog.
by Captain Stooben May 9, 2010
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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.
by Superman Dat Hoe December 22, 2007
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