I didn't go to school today cuz I wasn't feeling too great.
This page explains what the abbreviation "cuz" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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People use cuz in place of "because" cuz it's shorter to type. (And also, it looks cooler.) Cuz is the most common abbreviation for "because," with bc, cz, bcz, and bcos all placing as runners-up.
In most cases, cuz stands for "because." However, cuz can also be used as an abbreviation for "cousin." Don't worry, though, cuz context will likely tell you if the cuz you're reading means "because" or "cousin."