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8.
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
 
9.
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
 
10.
Sexually pleasurable act of a woman fondling a man's testicles/scrotum during intercourse in the doggy-style position.
We were doing doggie, hips smacking her ass balls swingin', when she reached back and underdogged me! Almost exploded right then and there....
by Surly T January 28, 2010
 
11.
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
 
12.
a person who is unlikely to win in a competition or is at a disadvantage
He was the underdog but he came out on top anyway.
by The Return of Light Joker October 25, 2008
 
13.
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
 
14.
The UNDERDOG is a player or a soldier that was or is under and still fighting.
Tupac Shakur is the UNDERDOG
by oz April 11, 2004