The practice of passing gas in a crowd of people unbeknownst to them

Walking past someone and farting.

Expelling gas through your ass as you stroll by an unsuspecting victim so as to render them unconcious.

when someone passes gas around you and then escapes as if it never happened

A term used by servers in a restaurant. When you have a table of assholes, you ask a co-worker if they can "crop dust " the table. As they pass by the table, and trail a nasty fart around said table. this keeps you blameless.

TO fart as you walk in front of someone in order to make them get the full effect of it.

When a guy tries to squeeze past someone and his "package" rubs against them on the way by.