Stoner 
The counters
Checo's Taco Shop, at 2601 N. Scottsdale Road in South Scottsdale, is the drive-thru answer, with breakfast burritos in the morning and a kitchen that runs late. It's the rare useful thing in Scottsdale after midnight outside of Old Town. Let somebody sober do the ordering.
Maskadores Taco Shop, at 7620 E. McKellips Road, is down at the bottom of the city and worth the trip when you're already south. Tacos y Huaraches, at 8418 E. McDonald Drive, is the central pick, opening early enough for breakfast tacos and sitting close to McCormick Ranch.
Beyond those, drive McDowell and Thomas and trust the old rule: if the lot is full and the sign is faded, go in. Tacos de cabeza and lengua are where a good counter shows off.
The Old Town version
Barrio Queen, on Stetson Drive, does big plates, street tacos and tableside guacamole. Diego Pops, on Scottsdale Road, is the loud, bright one with a patio and a wait on weekends. Both are good and both will be full of people in matching shirts. The Mission, on Brown Avenue, goes darker and more modern, with tableside guac and pork shoulder tacos.
For a slower Mexican dinner, Los Sombreros sits in a converted house on Scottsdale Road, and Los Olivos has held down Second Street in Old Town since the forties. Neither is a taco stop. Both are worth a real sit-down.
The Sonoran dog situation
A Sonoran dog is a bacon-wrapped hot dog in a soft, slightly sweet bun, loaded with beans, onions, tomatoes, mustard and mayo, with a roasted chile on the side. It's one of the great munchies on earth.
Here's the honest part. We couldn't confirm a dedicated Sonoran dog stand with a permanent address in Scottsdale. Carts come and go, so if you spot one on McDowell with a line of guys in work boots, get in that line. But the established names are over in Phoenix: Nogales Hot Dogs on Indian School and on Bell, El Caprichoso on 35th Avenue and Lupita's on 32nd Street. Many run late into the night, so a rideshare and a plan are the right call.
And yes, Portillo's on 90th Street has great hot dogs. They're Chicago dogs, though. Different religion.
How to do it right
Sesh at home, not in the lot. Restaurant patios and parking lots aren't the place, and a parked car isn't a loophole. Then rideshare, walk, or bring a sober friend who likes tacos. If you're doing a drive-thru run, that friend is your hero, so buy their order.
For the wider food map, the Scottsdale munchies guide sorts everything by craving, and the late night guide covers what's still open after the bars.