rest 'em upadj.U.S.slang (rare) (in CB radio communications) designating a place at the side of a road where vehicles may pull off the road and stop; cf. rest arean. at restn.1 Compounds 2a.
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1975 L. DillsCB Slanguage Dict. 50Rest 'em up place, rest area (SE).
1976 J. K. Lieberman & N. S. RhodesCompl. CB Handbk. vi. 157 Hey, we just spotted a smokey at that rest'em up area.