Top definition
verb. To cock-block a fraternity brother while in only your underwear as he attempts to hook up with a girl he'd never have a chance with.
Rudy had that girl in her thong in the hottub until Tim walked by and gueliched him.
by Dillon Collier February 08, 2005
Get the mug
Get a Guelich mug for your mother-in-law Zora.