An unofficial form of prostitution where (usually a woman) has money added to her prepaid cellphone in exchange for sex. Used on the island of St. Kitts and possibly other caribbean nations.
"What's up?'
"Oh, not much, my girl dropped by for some top up sex earlier"
"How much did you give her?"
"20 EC"
Brendon: Oh, well imagine; as I'm pacing the pews in a church corridor,
and I can't help but to hear, no I can't help but to hear an exchanging of words.(while wearing a sexy top hats)