This Slang page is designed to explain what the meaning of bet is. The slang word / phrase / acronym bet means . Online Slang Dictionary. Meaning, pronunciation, example sentences, and more from Oxford Dictionaries. with object 'most people would bet their life savings on the prospect'. This Internet Slang page is designed to explain what the meaning of BET is. The slang word / acronym / abbreviation BET means . Internet Slang. A list of.