"check yourself, before you wreck yourself"
[chek-yoor-self-bee-fohr-yoo-rek-yoor-self]
idiom
1. Slang. Used as a warning for someone to consider their actions and/or words carefully & correct any mistakes or misgivings before they end up regretting said actions and/or words.
EX. Sometimes, I need check myself, before I wreck myself. Then I eat a Snickers.