It's cause we blowing like a C4
Got my whole crew blowing like a C4

from Drake (Ft. The Weeknd) – Crew Love Lyrics on Rap Genius

Meaning

Blowing up is a term meaning a substantial, sudden burst in popularity, usually the result of an unprecedented contribution to the music industry. The Weeknd’s music is unlike any other, and he, Drake, and the rest of OVOXO are blowing up as a result.

BUT, judging from Abel’s other music, and the opening line of this song, he could very well be using “blow” to refer to cocaine.

C4 is a type of plastic explosive.

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