can be used to describe anything funny, outrageous, or just plain annoying. Also can be used as an interjection. Can be randomly said.
*someone steals your potato chips* Evil Lag! Give them back!; My door was being an Evil Lag today and refused to open, so I was stuck outside in a long and violent blizzard; In 6th hour today, we watched a boring video, so I just randomly said "Evil Laaaaag!"