to
go for a vincent actually means
go take a piss.
the phrase comes from a Quentin Tarantino film PULP FICTION, in which the character named Vincent
Vega (starring John Travolta), is always "oh so desperate" to use the bathroom facilities all the time.
Vincent: ...so not only i shot that
guy in the face, i have a very bad luck walking out of the toilets... never consider to
go for a Vincent, unless you expect
something catastrophic to happen later...