Does not necessarilly mean hanging upside-down while sleeping.
John: "Where the fuck is Harry?"
Dick: "It's 4:45, he's probably got a belly button full of his own cum, passed out on his couch with some B Grade porno blaring in the background"
John: "True, that dirty bastard loves having a Batnap."
Instead of doing pull-ups I took a bat nap from the bar.
I feel utterly refreshed after a nice long bat nap.
I didn't have time to take a shower after my bat nap so I just went straight to the office.
After taking a bat nap at my friends house I blamed it on the dog.
Bat Naps are all the rage in Canada.
Celine Dion takes a bat nap before performing every night.