getting knowledge 

to get your dick sucked, to get head, aka skull fucking

yo my nigga zois was gettin some knowledge the other day

getting knowledge by Dave Willis February 6, 2005

gettin knowledge 

means the same thing as gettin head, gettin dome, etc. Sometimes gettin head is called gettin brains, and this led to "gettin knowledge" because brains=knowledge. Jadakiss used this in "nasty girl" when he said "since she a good girl that attend college, i don't let her gimme brains, i jus let her gimme knowledge".

"Yo, what'd you get into last night"
"Man, you know I had to cop that knowledge"
"Haha, AIIGHT"

gettin knowledge by bizzle February 13, 2005