It is a derived from the idea of purchasing a soda at a restaurant and having unlimited ReFills to your hearts content.
in terms of sex, a ReFill sometimes confused as a booty call, but instead is the close sister of a booty call
A ReFill is having open sex access to ex-girlfriends or other girls whom youve taken their virginity from thus allowing them to be attached to you indefinately.
* These videos are coming directly from Youtube, they may or may not be most relevant to the word "Refill"
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