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2.
1. The Area that should be checked before emitting a really terrible fart, when farting, or in most cases, about to fart, you should check a good distance of five to seven feet to make sure no innocent bystanders or pensioners are in the area.
2. Used by the military to check the distance is safe before rifing a rocket launcher
John Boy Goode: OMG I THINK IM LIKE, GUNNA YOU KNOW, DROP ONE
Peter Pluffiey: Check your back blast dudeeee
by Mefodikal April 21, 2006
 
1.
The pool of jizz left on a girl's back after pull out and shoot. Can be wiped up with about anything
Man, That back blast on Teet's butt last night looked like an ice-skating rink.
by Boz Scaggert November 04, 2006
 
3.
The left over remnants from someones shit that are blasted on the back of the toilet.
Hey Tom, Thad just back blasted all over the toilet!
by jwc's July 19, 2006