leet (n.1) Look up leet at Dictionary.com
in reference to special court proceedings, late 13c., from Anglo-French lete, Anglo-Latin leta, of unknown origin; OED suggests possible connection to let (v.).
leet (n.2) Look up leet at Dictionary.com
ASCII alternative alphabet used mostly in internet chat, by 1997, derived from elite (adj.), and sometimes the word also was used as an adjective in that sense in online gaming.