Green’s Dictionary of Slang

rays n.

In phrases

catch (some) rays (v.) (also bag some rays, cop..., get..., grab..., lap..., soak..., take..., catch sun, catch sunrays)

1. to sunbathe; thus backform. rays n.

[US]Baker et al. CUSS 182: Ray [...] Rays, bag [...] Rays, catch [...] Rays, cop the [...] Rays, get [...] Rays, gorp up the [...] Rays, grab some [...] Rays, lap some [...] Rays, soak in the [...] Rays, take in [...] Rays, take some Sunbathe.
[US](con. 1950s) H. Junker ‘The Fifties’ in Eisen Age of Rock 2 (1970) 101: I dunno, whaddya wanna do? Catch some rays.
[US]A. Maupin Tales of the City (1984) 159: He needed all the rays he could get.
[US]A. Maupin Further Tales of the City (1984) 71: I’ll catch some rays in the courtyard.
[US]Eble Campus Sl. Mar. 6: Soak some rays.
[US]D. Gaines Teenage Wasteland 58: It’s a warm spring afternoon. A good day to cop some rays.
[US]D. Burke Street Talk 2 2: Have you heard their latest hit, ‘Baggin Some Rays on the Beach with My Homey?’.
[US](con. 1986) G. Pelecanos Sweet Forever 36: Kids played Frisbee and caught sun and walked bandanna-clad dogs.
[US]Dr Dre ‘Ackrite’ [lyrics] It was just one of those days / when I wanted to catch sunrays.
[UK]N. Barlay Crumple Zone 160: Hi baby you’re probably out soaking up the rays.
[UK]E. St Aubyn Mothers Milk 48: Jilly’s poolside, catching some rays.
[US]C. Eble (ed.) UNC-CH Campus Sl. 2011.

2. (US teen) goodbye, a feasible alternative farewell in sun-drenched California.

‘Valley Girls’ on Paranoiafanzine [Internet] So congrats! You’re ready to take your place among totally warm babes and viscious dudes alike! Catch some rays!