*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 who'm you've taken their virginity from thus allowing them to be attached to you indefinately.
Dave: Ex-Gf. I need to get laid.
Jeff: Ahhhh, I too enjoy ReFills.
'Did ya win!?'
'Nope...lost to some jew wearing a cowboy hat'
'Time for a refill....'
'Garry, want a beer?'
'STFU! Can't you see I'm refilling!'
'Ms. Johnstone could do with a refill'