When a person, animal or thing does not let you continue whatever your doing, or slows you down and says the word "problem?" repeatedly. Trollfacing can also refer to when someone is annoying or would not keep quiet.
-"Dude, why are you so late?"
-"Because my little brother was trollfacing me on the hallway"
-"Why didn't yo do your homework?"
-"My internet was trollfacing and didn't load the page