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The male genitalia being viewed from an upward looking angle. Similar to the female version of underboob but with a wiener instead. Also referred to as Australian dick.
I knew I was going to have a rough day when I woke up to my roommate giving me some undercock.

Your mom seemed pretty interested in me so I gave her a little Australian dick.
undercock by nubforce November 26, 2010
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A man who has smaller penis compare to his male friends'.
Tom: My gf thinks I have a big cock but she doesnt know that I am an undercock compare to what my friends are packing
A guy in the forum: Dude you sound so gay!
Tom: No I have seen them naked at the gym and besides I am only 5" long
A guy in the forum: lol you are an undercock indeed!
undercock by jimissobored July 27, 2014
The act of insulting or undermining someone against their judgment and knowledge, resulting in an insult of their manhood, usually making them angry.
John: "Yeah I made the final score in that pickup game, it was pretty impressive if you ask me."

Mike: "Funny, because from what i remember you got teabagged pretty hard and fumbled the ball a bit before making the shot."

John: "Don't undercock me Mike let me have my moment!"
Undercock by bodacious davis January 23, 2011

Undercover Thug 

-Its a person that is bad or do bad things but to parents or any one that dont know the person is good or thinks is good
- Someone that most know a thug but others that dont believe it or dont know it
- Someone that looks innocent but does bad things
Undercover Thug- A wolf with sheep clothing
Undercover Thug- My son or daughter not a bad person but....
Undercover Thug- Opposite of a undercover cop
Undercover Thug- Someone that do bad things or live thug life but almost never get caught doing them.
(This could mean the same for undercover gangsta, or gangster to)
Undercover Thug- Unusual Suspect
Undercover Thug by tnst December 19, 2014

Underfucked 

sexually deprived
1. Yo look how hard she's hitting on him... she's definitely underfucked!

2. That guy is completely underfucked. He just desperately asked her out again after she told him to fuck off for the third time...
Word of the Day on December 4, 2022

undercookie 

a cookie that has not been sufficiently baked.
seth: You should take the cookies out.

hannah: No way, man! They are liquid on top! Them bitches be undercookies!
undercookie by squallshaper March 14, 2008

Undercover-bitch 

When someone acts like butter couldn't melt, but secretly they're a total bitch
Person 1: Hey did you see Madonna fall?
person 2: Yeah, but she's such an undercover-bitch, it was totally karma
Undercover-bitch by Joe D + Imie T February 28, 2015