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1.
A back hand slap similar to that of a pimp slap but with greater force, speed and sound upon impact, so much in fact that the recipient is stunned in complete silence for a short period of time due to the surprise of the whole experience. It is usually administered to one's face, or back of one's head, after the recipient of the Uncle Derrick Slap or UDS has commited actions deemed inappropiate or unruly by the occassion (church services, lectures or a funeral, etc.). It is usually performed as a punishment for a small child's disruptive behavior but it could be applied to any situation when needed. It can also be considered a Guyanese parents version of keeping one "pimp hand strong"
The slap was created by a man Derrick G., our uncle hence the name "Uncle Derrick Slap" and popularized after seeing him demonstrate it on Chris after he became very annoying and disruptive at an AY meeting
My little brother wouldn't stop asking me for more cookies, even after the seven he already had casued him to go in a cookie-induced sugar rush, so I Uncle Derrick Slapped him.

Hey Bob, yesterday Jimmy said a joke that was so unfunny, it caused me to be enraged to the point that I Uncle Derrick Slapped him across the face. Needless to say he's still crying in the boy's bathroom.
by Elmac December 31, 2007