Top Definition
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.
by nubforce November 07, 2010
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!
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!"
by bodacious davis January 22, 2011
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