Spanish:

–Señor, mi mamá quiere saber qué vende.

–Dile a tu mamá que ceviche.

English:

–Mister, my mom wants to know what are you selling.

–Tell to your mom that ceviche.

Ceviche is, well, ceviche. In north west of México, we often say “vichi” to say “nude”. “vicharse” would be “get naked”, so “Dile a tu mamá que ceviche” can be a pun for “dile a tu mamá que se viche” (Tell to your mom that get naked)