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1.
The noise that is made when a penis is being deep throated.
Male - "Oh yeah, suck on this purple mushroom tip"

Female - "Guck, guck, guck, guck, guck"
by Gucking May 20, 2014
 
2.
First of all 'Guck' does not mean to "fuck your mom" or whatever they put. It means dirty ok DIRTY
Damn these shoes are guck
by Yeeeeaaaaahhhgh June 30, 2014
 
3.
guck (n) / Goo that provokes one to express the word "yuck" when come to contact with it.
Anyone : "Eww, I just stepped in some guck. Yuck!"
by tarealist September 17, 2013
 
4.
To hardcore fuck, usually in your moms ass.
Ey yo nigga, I gucked that dudes mom so hard!
by SkeezyWasHere March 13, 2010
 
5.
When you do a typo. For exemple, when you want to write fuck but you do a typo and write guck. Because of this typo (that I make regularely) you call any typo a guck.
(chatting on MSN)

person 1: sorry... but i cant make it to your party

person 2: (very frustrated) what the guck!!!!!!!!

person 1: guck?????

person 2: fuck* sry bout that

person 1: dnt worry bout it bud i guck a lot 2

person 1: dont* lol
by kicknickinthenet November 19, 2007
 
6.
to post nude pictures of your ex girlfriend on their own website.
The guys from Urban Dictionary need to guck Sharon Turner.
by bread infection December 04, 2009
 
7.
A wet stinky mushy turd that peeks out of the water in the toilet bowl (mostly dark in color)
He had to make a guck before his shower.
by gayjo October 11, 2006