I have heard the following (informal) dialogue in the TV series Marseille:
- X: Je veux pas rentrer dans tes combines.
- Y: Quelle combine?
- X: Tu crois que j'ai que ça à foutre, de charger du shit.
- Y: Ça y est, tu parles comme ça, maintenant. (after holding X's neck and approaching his mouth to X's ear) Tu sais que tu vas manger, petit enculé!
Context: Y, a neighborhood gangster, wants X to transport drugs in his car for him, but X doesn't want it.
The last sentence sounds like a threat. "manger" obviously doesn't mean "to eat" here. What does it mean? "to pay (for the lack of respect)" ?