Meaning Because
Type Abbreviation
Rank ★ ★ ★  Common
Usage General (not just online)
Comments The more common abbreviation is "b/c."
Example "I didn't go to class 2day bc I wasn't feeling well."
Updated September 7, 2017
Meaning Be cool
Type Acronym
Rank ★ ☆ ☆  Uncommon
Usage Online Only (chat, messaging, e-mail)
Comments Can mean "Stay cool" or also "calm down."
Updated August 1, 2013