Meaning of “foam pie” in the English Dictionary

british dictionary

"foam pie" in British English

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foam pienoun [ C ]

uk /ˌfəʊm ˈpaɪ/ us /ˌfoʊm ˈpaɪ/ UK

an amount of shaving foam on a paper plate, etc. that is thrown at someone's face to make people laugh or as a protest:

He was attacked by a protester with a foam pie.

(Definition of “foam pie” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)