ca·per 1 
(kāpər)
(kāpər)n.
1. A playful leap or hop.
2. A frivolous escapade or prank.
3. Slang An illegal plot or enterprise, especially one involving theft.
intr.v. ca·pered, ca·per·ing, ca·pers
To leap or frisk about; frolic.
[Alteration of CAPRIOLE.]