A blowjob with a mouth full of dip.
It's self explanatory and created by the almighty McNasty, TheDooo, Soup and Blarg.
Go check out their amazing content on youtube ;)
"Ayo did you hear?"
"Hear what?"
"I heard some chick gave that dude a sloppy dallas!"
It is an oral sex act, blowjob, that the giver does to the receiver while having a mouth full of dip of any varieties.
Cameron is currently giving Eric a sloppy Dallas while he is sitting playing Call Of Duty; Modern Warfare, eating chips, talking sh**, as he excrements himself.