Taken from the practice of leaving a car which has been thoroughly stripped up on concrete blocks. Something is said to be 'on blocks' when one comes back and finds it has been ransacked thoroughly.
I told you not to let anyone in--now my whole room's up on blocks!

Wait til Oscar gets back and finds his DVD collection up on blocks . . .
by Secret Agent Man September 18, 2003
A phrase referring to an occurrence of menstruation (i.e. being on your period).
"Cmon honey, I've been thinkin about that sweet ass all day..."
"I cant baby, Im on blocks"
"So?? We'll double up the naughty towel!"
by Olaf the Black May 15, 2009
a term that proves to someone that you're not frontin. same as 'on mamaz' or 'on citas'. originated in the bay area
guy 1: let's put this shit down

guy 2: stop frontin'

guy 1: on blocks nigga
by fieldshityeee August 30, 2008

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