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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you're sitting on the couch eating a bowl of pop corn and watching star wars and your spouse comes running in front of you with a cape and assless chaps on and releases explosive diahrea's on your face...then your partner runs away screaming ,"UP UP AND AWAAAAY!!!!"
"oh shit my wife just gave me the underdog ...WHILE I WAS WATCHING CONAN!!!...then she flew away like a boy wonder!!!"
by shithead mcgee June 12, 2007
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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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