Green’s Dictionary of Slang

(US campus) underhand, deceitful, clever, sophisticated.

1994		Eble Campus Sl. Apr. 8: stealth – clever, tricky, particularly with regard to dealing with the opposite sex.
1997–2000		Da Bomb 🌐 26: Stealth: Sneaky.
2000		Ebonics Primer at www.dolemite.com 🌐 stealth Definition: the ability to get things done and be able to shut-down any mofo’s who try to stop you. Example: That fool is one stealth ass son of a bitch.
2007		B. Coleman Check the Technique 22: ‘ I guess you could say that I was the stealth music director for everyone’.
2012		M. Lacher On the Bro’d 64: Ricky didn’t want me to fuck Liana [...] ‘Don’t try to like stealth-rail her’.