A wide on is a joking term for a man to brag about the width of his penis or if he says he has a small penis he can say he's got a wide on, meaning his penis is wider than it is long. Sometime my penis does not get as long as normal when hard but it is always wide. The penis is a remarkable organ, mine ranges in size during the day from 1" long to as much as 8" long after forplay. The head is always wide, it amazes me how big it gets. I'm in my sixties and need a little help from my lady to get it up. She sucks my nipples and it's like the nerve is directly connected to my penis. Anyway folks, a "wide on" is a joking term. Dream on - a 'wide on' refers to sexual stimulation of the FEMALE genitals. Like male genitalia, a woman's sexual parts respond to erotic stimuli by receiving an increased blood flow - this causes the labia to swell and spread, hence 'wide on'... Any other attempt at an explanation is lame and limp dicked.