15
An old expression from the Australian bush. Before sawmills made their appearance, felled logs were dragged to a saw-pit and cut lengthwise into planks by two men using a cross-cut saw, a mean beast of a thing up to 10 feet long. One man would stand on top of the log and push down, and the man underneath standing in the pit - the underdog - would push the saw up.

A rotten job, with sawdust in your eyes all day and really hard work compared to the top dog who just had to push the saw down. The boss never saw how hard this man worked, so he was less likely to get a better job, a pay rise or be noticed at all.

Now an underdog is someone - or something which is going to struggle against superior odds to win a contest.
The new Vegetarians Party will always be the underdog in Texan elections.
by plonk o'clock April 03, 2014
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16
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 06, 2009
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17
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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18
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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19
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 09, 2011
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20
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 06, 2003
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21
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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