This phrase is not commonly used as a slang term in Spanish. Its literal translation is 'you ate plastic chops'. It's possible that in a very specific local or regional context it could have a different meaning, but generally it's not recognized as a standard piece of Spanish slang.
Examples
- Spanish: No puedo creer que comiste chuletas plásticas en la fiesta.
- English: I can't believe you ate plastic chops at the party.