Top definition
i made this one up, and i like it.
a vanilla mouthwash is a big hot load of cum, delivered into the recipients mouth with the expectation that they gargle on it. bonus points for not gagging.
"gary said that we had to leave the bar urgently, so we walked into a nearby park. next thing i knew, he sprung a nasty big vanilla mouthwash on me."

"girl, if you keep talking dirty to me, i'll have to give you a vanilla mouthwash"

"that girl a hoe - she got 4 different vanilla mouthwashes in one night"
by April 09, 2003
Happy St. Patties Day!