5 little girls with fat little thighs

The story:

we were having a party out here by the river where we live, with about 5 couples whom we have known for over 15 years. sitting around a campfire playing old music and consuming too many margarita's. this was actually the only tull song i knew, and thought i knew well!! at first they didnt think i was singing but talking about someone with fat thighs. when i explained i was singing the song. everyone lost it! i laughed so hard with embarrasement i was doing that snorting laugh and pee-ed my pants