look up any word, like vai tomar no cu:

1 definition by atomic bomb46

short for underground. usually used when describing a rapper, but can be used for other things as well.
mikeyc482: dude did you hear that rapper haystak? he's fuckin WACK!
steve08: no i never heard of him
mikeyc482: yeah, he's udg
by atomic bomb46 March 08, 2009
1 4