This is so absurd it would knock your teeth out laughing.
Tips
usage
大牙 most often means 'molar' (the back grinding teeth, also called 槽牙 cáoyá). Colloquially it can also refer to the front teeth. The set phrase 笑掉大牙 ('laugh until your teeth fall out') is a vivid way to call something absolutely ridiculous.
memory
Literally 'big tooth' — the big chunky teeth at the back of your mouth that do the heavy chewing.
