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The form of laughing by a fat retarded old man. during this process his shoulders will shake up and down, like he has palsy or is having a seizure.
when the fat old fuck laughed he went, "YEEH! ha ha ha" while shrugging his shoulders up and down.

The retarded old man was Yeeheeing
by Joge The Don April 22, 2009
A common salutation, indication of agreement or even excitement amongst black people.
Tyrone: Yo dude, did you see that? I think she has herpes.
Jarome Iginla: YEEH!
by Frank The Tank_69_IGRY March 20, 2008