Adjective: Soft; squishy; squeezable; feminine; most importantly, oxytocin-inducing upon touching or seeing; as in the oxytocin-inducing effects of squeezing or seeing a cute dog or cat. Also can be used as a derogatory term, meaning excessively cute, to the point of annoyance. Coined by my brother in 1979-82, therefore any other definitions are just misspellings of the pre-existing word "posse" or "possie".
Verb: To aggressively squeeze or squish another being, mainly mammals that induce oxytocin by doing so.
Adjective: "What a possy cat that is!"; or "That is the possiest dog I've ever seen!"; or "Quit being so darn possy!"
Verb: "I'm gonna possy you up real good!"; or Don't make me have to possy you!"; or "I'm gonna possy up that girl like so sweetly!"