When a woman is sweating intensely inside her vagina so that it forms a "lake" of sweat. The penis then stirs the sweat in a circle to push it farther down the vag.
A sexual maneuver reserved for the extreme. Prior to coitus, the female inserts a curling iron or other warming instrument into her vagina. The warmth and physical stimulation produces a chamber much like a hot tub for the male to insert his penis into. Following insertion, the male refrains from any movement, initiating a warm and relaxing soak.
A woman who upon first meeting comes across as strikingly attractive but, who after time gradually loses her appeal.
It derives from the overwhemling sensation you get when you first step into a hot tub. Once acclimated, however, you want to kick yourself for ever making such a big deal in the first place.
Mikey: I can't believe I was so obsessed with Melissa. What was I thinking?
E: It's not your fault - you fell for a hot tub. It was just a matter of time before you came to your senses.