U.S.P. - Amphetamine; methylenedioxymethamphetamine (MDMA)
Ultimate - Crack Cocaine
Ultimate - Xphoria Methylenedioxymethamphetamine (MDMA)
Uncle - Federal agents
Uncle - Milty Depressants
Unkie - Morphine
Unotque - Marijuana
Up against the stem - Addicted to smoking marijuana
Uppers - Amphetamine
Uppies - Amphetamine
Ups and downs - Depressants
Utopiates - Hallucinogens
Uzi Crack; crack pipe