Usain Bolt was locked and loaded in Cape Town this past weekend ... tearin' up the South African party city with the help of a gold-plated champagne super soaker!!
Bolt rolled through local hot spot Grand Cafe & Beach with a small entourage -- poppin' bottles, smokin' cigars and (of course) gettin' his groove on.
The retired sprinter's Sunday Funday wrapped a little before midnight -- but not before he blasted his homies with some heavenly Brut.
Ain't no stoppin' the World's Fastest party train!