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)
Tom: Great, until the end. Took her back to my place, and she decided to blast off. Picture a leaf blower on your nuts.
Jim: WOOOO BOYYYYY
Mike was so desperate to get on the other side of the river that he had to blast off in one magnificent leap.