The action of miggsing someone is to
fein masturbation whilst having your back to someone as they are walking by. As they draw level, spin round and fein throwing semen at them. If the person you are miggsing is familiar with the practice then they are obliged to fein catching the semen in their mouth followed by an exaggerated swallow and a loud "
yum, yum" exclamation.
This expression and
charade is believed to have orininated in the
Slough area, circa 1996.