We found one dictionary that defines the word piston slaps:

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1. piston slaps: Collins English Dictionary

▸ Words similar to piston slaps ▸ Usage examples for piston slaps ▸ Idioms related to piston slaps ▸ Wikipedia articles (New!) ▸ Words that often appear near piston slaps ▸ Rhymes of piston slaps ▸ Invented words related to piston slaps