to have sexual intercourse; the knock refers to the man's hips hitting the woman's ass, which produces a slapping sound. The motion litterally knocks her boots (buttocks): "Bring your friend, I likes you two's I'll knock the boots, the sneakers and the house shoes." -- Digital Underground (Flowing on the D-line [??])
An Knocking idiom dictionary is a great resource for writers, students, and anyone looking to expand their vocabulary. It contains a list of words with similar meanings with Knocking, allowing users to choose the best word for their specific context.
Dictionnaire de mots similaires, Différentes expressions, Synonymes, Idiomes pour Idiome Knocking