A combination of probably and possibly. Less certain than using probably but a bit more confidence than using a simple possibly.
John: With everything still closed because of the Coronavirus, are you gonna catch up on some Netflix over the weekend?
Zack: Prossibly
A more subtle way for men to state they would like to have sex with a girl if they could.
Paul: "Holy shit! Look at that brunette in the short skirt. I would totally pee in her butt."
Zack: "Yep. #1 in tha bum."
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