Arriving at a social gathering with the sole intent to drink beer(s). People making a beerpearance do not plan to come for food or small talk. They just want to slug cold beers with a group.
I made plans to make a beerpearance at a kids birthday party Tuesday after work.
One who's age matches their IQ. They often have a "420" somewhere in their user name. A person who joins an Internet message bored to do nothing but asks stupid inane questions. This person is regarded as flame bait.