Making A Sissy

I guess I should have mentioned what it does mean, eh? It is a euphemism for peeing. I'm basically trying to figure out when it was popularly used and where it came from. Thanks.

Justin

I know what this one means but can anybody here shed any light on its origins?

Never heard it. (USA)

I'd guess that it comes from the "sissss" sound of the stream of liquid. (Also USA)