DummyThick is a misspelling of the word Dummy Thicc which means but is not limited to someone having more mass than usual in certain parts of the body.
Ayo, your bitch so dummy thick i clapped that ass last night, sorry bro.
its spelled dummy thicc, not dummy thick you inbred prick.
Ulzzang true definition is "best & "face" = best face in korean. They are basically people with above average looks, sometimes with the use of photoshop and haduri who post their pics online, some becoming internet celebrities.
"Hey, see that chick over there? She's pretty enough to be an ulzzang. :D"