blood whistle 

Whistle that sounds like suwoop

Nigga 1: Where all da bloods?
Nigga 2: Hol up, blood whistle
(Niggas begin approaching)

blood whistle by basedcock April 13, 2014

bloodthistle

Slang for Marijuana

Yo nigga let me hit you up for some of that bloodthistle

bloodthistle by Greg from d-block January 6, 2008