Noun; A type of shoe (most worn: Vans Slip Ons) that do exactly what the name states, slip on. No laces. Just shoe. Comes in assorted colors.
Dude 1: Dude I just got some sweet slip ons!
Dude 2: Dude sweet I wanna get some!
A pair of shoes that is a sub category of slippers. They slip on just like slippers, hence the name slip ons.
The slip ons originated from slippers but are the more modern version.
Woah! These slip ons are cooler then old school slippers.