The act of masturbating whilst blazing it. Also commonly known as 'disappointing your mother.'
Boyfriend: I've got to go do something, brb
Girlfriend: Ooh, what are you doing?
Boyfriend: Uhh... Weedwhacking.
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Masturblazing is when you jack off while smoking weed.
Guy 1: My parents caught me masturblazing last night.
Guy 2: What did they do?
Guy 1: Join in...