Green’s Dictionary of Slang

(US prison) an informer; thus as v.

2000		Other Side of the Wall: Prisoner’s Dict. July 🌐 Weezo: Snitch, informant. (TX).
2005		J.E. Lawson Last Burn in Hell 12: If you’s a fuckin’ weezo we gonna split yo muddafuggin’ wig.
2006		Prison Slang Mommyblogger mydogharriet.blogspot.com 2 Mar. 🌐 Dig this out: go in to his boss and drop a dime on him! Weezo his ass!