from Latin crepitāt-, ppl. stem of crepitāre to crackle,
frequentative of crepāre to crack, creak + -ate
1623 - (for Definition1) The English Dictionarie, or an Interpreter of Hard English Words, Henry Cockeram;
"Crepitate, to winde or fart"
From: Fraser's Magazine for Town and Country
Volume XLVII. January to June 1853