look up any word, like vai tomar no cu:
 
1.
The act of being an uggo.
Yo, Steph is uggin. Hard. You shouldn't hit it.
by The Chil October 01, 2006
2 3
 
2.
an ugly third nipple or mole, usually on the torso. an ugly version of Chandler's nubbin or third nipple from the television show Friends.
my boyfriend has an uggin on his back.
by littlebethb August 03, 2005
1 2