When looking at a woman from behind and she has her feet together, you can see daylight through inbetween her thighs

Internet persona(s) who happens to follow you and you happen to follow them back and maintain communication with and have a mutual liking for eachother whether it be friendship wise, etc. (Mutuals if more than one mutual)

When the thigh is connected to the vagina due to a mass build up of fat in the croch region.

Legs so fat that you can lube them up and use them instead of a vagina.