Had this POOTR 1 Toyota been one of the little hopped-up sporty jobbies with the fart can exhaust that’d have been perfect. Sadly it wasn’t. This was an aging Yaris or similar.
As to your Toyota SUV I bet something related to “Bismarck”. Either the city, the donut, or the 19th century politician. Or a guy whose name is Mark who goes by “Marky” and fancies himself a business wheeler-dealer.
Or perhaps he’s engaged in some murky business the details of which are better not investigated if ya knows what’s good for ya. Capish? 
or Biz Markie
MARIKAY Could be someone’s name, or could be a Mary Kay salesperson… the car wasn’t a pink Cadillac though. It was a dark gray something or other, I didn’t get a good look.
Today I learned. Thank you.
I thought the B&W still in your first post was just a stock shot of somebody very demonstratively expressing “I can’t figure this shit out!!” Little did I know that was a pic of the car’s namesake.
To be fair, your guesses may well be correct, but my brain went for the Biz Markie connection.
I’m in Indiana, and this morning I saw LVCATS on a car parked in a driveway. I was too far away to see if the plate was of the PET FRIENDLY variety.
They might be a fan of The Cure, as well.
Yesterday I saw 4DA B1RD on a generic family van. So probably a variation on the expression “for the birds”. Or maybe some flavor of Birdie is the owner’s name or nickname.
What made me laugh was the plate background was the special one supporting sea turtle conservation. In FL sea turtles (and manatees) are the local flavor of charismatic megafauna for schoolkids and nature lovers to go gaga over.
Anyhow, the most likely outcome by far for any sea turtle hatchling is to be eaten by a bird during its 50-100 foot race from its beach nest to the sea.
Perhaps the van owner has the same morbid sense of humor I do? One can hope. 
R SOX on a Brewers plate
In July, I saw LAST on a black White Sox plate. Not sure if it has another meaning, but I was wondering why someone would go in on a Sox plate and then customize it that way. Or maybe it was a Cubs fan.
I’ve not ever seen this plate in the wild myself, but apparently there’s at least one Bears fan in Wisconsin who had a similar (and clever) idea:
Here’s the one I saw (a little soft from being shot through a windshield and being a tight crop.)
On the topic of hostile sports fan’s plates I posted this gem back near the top of the thread:
Seen today on an F-350: OVRSIZE
Yesterday I saw a new-ish Ford Mustang with the plate RWD.
No sissy EV or transverse 4-cylinder pulling his (good bet) car around. By golly, his car is a pusher just as gawd intended. Noisy too.
ALL SHO (on a Ford Taurus SHO
Saw D20 MOM on a minivan I was following in traffic this morning. I’m assuming D20 is referring to 20-sided dice?
That’d be my guess, but as an RPG player, d20 automatically signals that to me.
I saw a Maserati sedan today with ANM PHRM.
So “animal farm”? On a car like that they’d also be asserting they are more equal than most.
Or maybe it’s a far-fetched variation on “I am a pharmacist” after all the more obvious ways to say that had been taken?