(1) To SNIFFF any kind of drug. You can bump anything from medicine to Coke, K to Keef, Oxy to E. It applies to all pills, and all alphabet drugs.
(2) To play any type of musiq you listening louder. To turn it up.
These people who made their own defitions for it (kokane and some other fools) claiming a bump is specifically for sniffing yay are completely wrong. DO NOT be fooled by incorrect definitions.
(1) a.) Bump that linee
b.) Hit this bump real quik
c.) Put the yay on the key and bump it
(2) a.) Bump that track up
b.) I bump this sh*t whenever it gets
play on the radio