Non-penetrative sex involving the rubbing or grinding of the underside of a penis between the labia majora to produce both penile and clitoral stimulation, usually with the partner with the vulva on top. Related to the word "fucking" but is softer as it is non-penetrative. For the anal/intra-gluteal version, see "Hotdogging".
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).