Underdog 

When someone (usually a male) hangs upside down while someone else does either one of the following given:
1) Gives you a blowjob
2) Gives you a handjob
3) Fists you. Usually associated with homosexuals.
OR
When a female hangs upside down and you insert your dick in her vagina.

Guy 1," Get on the monkey bars and get into an underdog!"
Girl1 -"Orrr, You can get into an underdog and I can give you pleasure."

Guy 2 -"hey, can you get into an underdog?"

Guy 3 -"Sure."

Underdog by theguyinthecornerXX October 9, 2010

Underdog 

Someone that votes for the person to that has less chance to win a competetion. Just for fun, personality, or equality/balance

Mike tyson vs someone random lame guy.

Guy1: hey. Mike tyson is a champion. Everyone knows that. Im going to vote for him.

Underdog:Im going to vote for the lame random guy.

Underdog by TheTellerius August 15, 2016

underdog 

a very cool swing trick

yo i want to do an underdog bitch as nigga asshole nigga

underdog by scooterdabber September 17, 2017

Underdog 

A bbq sausage on bread with the onions placed underneath the sausage, not on top. Often found outside popular hardware stores.

Hi. Could I please grab 2 Underdogs and a coke.

Underdog by BillyAdams November 17, 2018

Underdog 

A nickname used by TJ Kippen for Cyrus Goodman on the best Disney Channel Show to ever exist 'Andi Mack'.
TJ uses 'Underdog' since their famous encounter by the Swings.

Or it's also known as an affectionate name for the only person, a not so scary basketball guy like TJ Kippen, can talk to like this.

"Listen Underdog. You can't do a somersault? I can help you with that."

Underdog by these-wings-are-made-to-fly May 19, 2019

Underdog 

A word some use to make the person/team that would usually win the the team that needs support, in order to make the other guy(s) the bully. It's a defensive strategy, that way you're always the underdog if you don't make it, and never the bully when you do, what kind of hypocrisy is worse than that?

The guy or team would call everybody else out on something while doing the exact same thing as what he/they were calling others out on. The guy team/would try and cut it as bullies without any of the negative stigma that goes with the title, then he/they would pretend to be underdog who was being picked on by the big, bad bully when it was convenient to do so.

Underdog by Solid Mantis November 3, 2019

Underdog 

In a thrown fight, the underdog was never really the underdog, the underdog was the team to beat (favored).

Anybody can call themself (selves) the underdog, just like anybody can call themself (selves) selfless to get support from people who wouldn't otherwise support them.

Underdog by Solid Mantis November 4, 2019