Eighties slang for suntanning, bagging sun, getting a tan.
"I'm gonna bang some rays out on the veranda. I've got my coconut tanning oil and a sixer. Come on out and bring your tunes in a box."
"It's so bad with clousy skies, I think I'll have to go bang rays in a box today (suntanning booth)."
"Dude, you're banging so much sun you're going to get skin cancer."