the slang reference to the state patrol, commonly known (at least in the west) to be much stricter and more hardcore than city cops and county sheriffs. they also drive faster cars and have way more skills at driving (trust me). kind of like po-po but not.
A: dude! did you see that? that charger that just passed us had a bullwhip antenna and a spotlight!
B: yeah, man, keep it under the limit tonight. the patro-po are getting smarter.