Simply put to get high on cocaine.
(Two guys pissing side by side at a urinal in a NYC bar)
Gay Guy says-"Do you like to party?"
Straight Guy says-"yeah"
Gay Guy says-"Do you blast off?"
Straight Guy says-"Yeah" (Not knowing what it means)
Gay Guy says-"Do you want to go into the stall?"
Straight Guy says-"Yeah"
(Both men walk into the stall and proceed to blast off employing the key bump method)
Gay Guy says-"Your fucking hot can I suck your dick?"
Straight Guy says-"No" (And proceeds to exit stall hastily. Comes home and defines this word on Urban dictionary)
by Chris Proce January 31, 2008
10 more definitions
Top Definition
Taking a hit of DMT (Dimethyltryptamine), as this will be your rocket ship to the moon!
It's been a long night, time to blast off and watch the sunrise.
by pocketfrog April 15, 2011
The act of smoking marijuana while you are tripping on acid.
(guy) Yo you want to smoke a blunt?

(guy2) Nah man im trippin balls

(guy1) I know but i wanna blast off!
by Lucidreamer February 16, 2011
When you are smoking some marijuana and you think you start to feel a little high, it is that intense high feeling you get right after you take one more hit that takes you to fucking space.
"Dude I just got a little high" *takes one more hit* *1 second later* "Hoooolllyyy shhhiitttt duuude, BLASTOFF!."
by Dennis V Blastoff March 09, 2010
an expression ofen used by youth in place of outdated terms such as "cool" or "bitchin'."
Dude! That dunk was totally blastoff!!!!
by Will "Blastoff" C. February 05, 2007
The act of cumming on a woman.
I had a hard blast off in her face after that mic check!
by Duke February 24, 2004
To cum vigorously and copiously.
Thinking about Rena really makes me blast off!
by pentozali November 06, 2011
When a girl is riding a guy cowgirl style. She begins to countdown from 10, and upon reaching 1 she "blasts off", by queefing on his dick as she jumps up into the air.
Jim: So how was your date last night?
Tom: Great, until the end. Took her back to my place, and she decided to blast off. Picture a leaf blower on your nuts.
by blastoffking69 March 07, 2010

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