Green’s Dictionary of Slang

carhop v.

[carhop n.]
(US)

1. to work as a waiter or waitress, serving customers in their parked cars.

[US]N. Algren ‘Watch Out for Daddy’ in Entrapment (2009) 115: I got a job car-hopping.
[US]Wentworth & Flexner DAS.
bitchypoo.com [blog] 9 July I can tell you horror stories of my teenage waitressing/carhopping days wherein I waited on a family of six with many small children running and screaming around.
[US]D.R. Pollock ‘I Start Overin Knockemstiff 166: ‘[T]hat girl is the spittin’ image of you back when you carhopped at the Sumburger’.
[US](con. 1962) J. Ellroy Enchanters 230: [of drug dealing] Babs Payton and Lila Leeds car-hopped. They hopped Stan’s Drive-In [...] It was a front. They peddled goofballs.

2. to work as a street prostitute, having sex with clients who drive up in their cars; also to solicit in this way; thus car-hopper n.; car-hopping n.

[US]T.I. Rubin In the Life 73: Car-hops, yeah, over in Brooklyn [...] Car-hopping is a Brooklyn thing. [....] I’m not no glamour-puss but not a car-hopper, that’s for sure.
[US]B. Rodgers Queens’ Vernacular 42: car-hop (fr pros sl) to solicit cruising drivers from the sidewalk. Also used of one who solicits in such a style ‘Vegas is one of the worst towns to car-hop in.’.
Sexual Homicide Exchange Inc. 🌐 Although one tends to see less hitchhiking within the city limits, ‘carhopping’ is a recent trend that has become a prolific and dangerous activity among teenage girls. This behavior consists of older men driving either a fancy vehicle or even a ‘hoopdy’ (an older, dilapidated car) offering drugs for sex or just rides to parties and a fun time to naïve girls looking for a little bit of excitement.
[US]J. Ellroy Widespread Panic 109: Babs Payton car-hopped and hooked out of Stan’s drive-in.

3. to steal from parked cars.

WisBar Legal Resources 🌐 In July of 1995, just before his fifteenth birthday, Matthew accompanied a friend on a ‘carhopping’ spree, and stood by while the friend stole various electronic items from a car and a trailer.
Sioux Merchant Patrol (SD) 🌐 Solved cases: 111 (includes 60 vandalism and 21 carhopping cases).