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!."
an expression ofen used by youth in place of outdated terms such as "cool" or "bitchin'."
Dude! That dunk was totally blastoff!!!!