The scenario is that you fancy a posh wank but have no condoms. Instead you decide to use a sock but unfortunatly choose one made from 100% Pure Wool. After "doing the deed" into the sock and removing your phallus, you find that fibres from the inside of the sock have mixed with the love juice and have now coated the one-eyed trouser snake in a sticky hairy coating making it look like a Wooly Worm.
No matter how hard you scrub, you'll be finding sock coloured hairs under your foreskin for days after (subject to not being Jewish)
He found so many hairs stuck to his knob the following morning, it looked like a woolly worm