Top definition
To be scared so suddenly the contents of whatever happens to be in your stomach to suddenly explode into your mouth cavity and then to be reswallowed.
"Oh crap man did you see how bad Olivia scared David with that freaky tongue thing?"
"Yeah dude, David got a dose of insta-vomit swag."
"Yeah dude, David got a dose of insta-vomit swag."
by #swagg September 04, 2011