蹭吃

蹭吃	cèng chī	to freeload for food
蹭	cèng	to rub against / to walk slowly / (coll.) to freeload
吃	chī	to eat; to consume / to eat at (a cafeteria etc) / to eradicate; to destroy / to absorb / to suffer (shock, injury, defeat etc)
吃	chī	variant of 吃