Top Definition
Moving part of an engine that rattles when loose resulting in engine failure. Slang usage as someone who's tappets are slightly loose (not quite with it - a.k.a someone who is a few sandwiches short of a picnic)

South African variation is of a tappet being a redneck in the american sense of the word
Donny is a real tappet.
Harvey is so tappet
von Tappet 13. November 2008

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