yiffpile /ˈjɪf.paɪl/noun 1verb 1forms 3 noun1 •(slang) A furpile involving sexual activity.Technically, what appeared on C.S.I. was a variant of a "yiffpile", itself a variant of a "skritchpile". — 2003 verb1 •(slang) To engage in a yiffpile. formsyiffpiled · yiffpiling · yiffpiles