When a man doesn't wear underwear under his clothes, it's called going commando or freeballing (because, you know, his balls are dangling freely). Now, when a woman doesn't wear underwear, what's that called? The term freeballing doesn't exactly work because, you know, women don't have balls. Hence, the term "vajayjay alfresco."
One should never -- and I mean *never* -- go vajayjay alfresco while riding a bicycle and wearing a miniskirt.