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on a promise 

In British English, "on a promise" simply means that you have arranged to or at least expect to have sex with someone in the near future - usually your regular partner.
Sorry, Dave. No drinks for me tonight. The wife found the handcuffs we used on our weddin' night, so it looks like I'm on a promise, know what I mean?
Related Words

pussy on the premises 

Living with a girl such that sex is readily available
Dag yo, you livin' with Hannah? Man you got pussy on the premises!