Take a rain check
The state of mind 1 second before ejaculating on her in a standing position, when you really really have to go pee and still want to finish your job . Result is always uncertain.
I didn't really take a rain check and peed on her instead.
can I take a rain check?
means: that you do not want to accept an offer or suggestion but you might accept it at another time.
Annie: i was just calling to see if you wanted to have lunch tomorrow.
MAry: oh, I'm Sorry I have a meeting at that time, can I take a rain check?....
MAry: oh, I'm Sorry I have a meeting at that time, can I take a rain check?....