Even my dog is sleepable, meaning willing to remain quietly next to me on the couch during an afternoon's long nap without excessive wiggling or passing of gas.
Slappage is the amount by which your balls urgently slap against the arse of the female you're banging.
example 1:
Stud thinking: "I need to give it more slappage, a lot more come on ya bitch get screamin"
example 2: man and wife in bed Woman : "Oh for gods sake Derek give it some fuckin arsehole slappage will you, come on swing them bollocks like a pair of demolition balls"