Matty tells Blaire "keep my dump truck's name out your mouth", the same way Will Smith famously said it to Chris Rock at The Oscars after slapping him.
The final scene of the episode shows Dennis passing by a sign on US Highway 6 that says it's 40 miles to Provincetown, Massachusetts, which would have him in close proximity to a town in Cape Cod called Dennis.
Mekka-lekka-hi, mekka-hiney-ho, is reference to Jambi from Pee Wee's Playhouse