蹭 (w)

(cèng) to rub against; to walk slowly; to freeload (colloquial)

蹭吃 (w)

(cèngchī) to freeload for food

蹭吃蹭喝 (w)

(cèngchīcènghē) to cadge a meal

蹭蹬 (w)

(cèngdèng) to have bad luck; dammit!