10-bagger
Definition, from the Venture Cyclist:
When a VC talks about a big hit you might hear them calling it a 10-bagger (a phrase apparently coined by Peter Lynch, of Fidelity Maggellan fame). A 10-bagger means that for every $1 of investment made, the VC fund receives $10 back when they sell their stake (either selling the company to someone else, or after an IPO).
Evidently, 10-baggers are “pretty rare” and 50-baggers are “mythical”.