The next day after smoking marijuana the previous night, one tends to feel very chill and lazy about everything. A dumbover is the next step up, but sometimes you don't get a dumbover, just a chillover. If you have a dumbover, you usually have a chillover. If you have a chillover, you don't always have a dumbover.
-"I only smoked a bowl or two last night before bed, so I have a chillover today haha."
-"I didn't go to class today because I had a chillover, so I just played FarmVille instead."
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.