Usually it's an ID Card that is fake. Usually fake ID's look like real id cards except they have different information. Many times fake ID's are things like driver's licenses with a different age. People might use a fake ID to get into a club, buy a drink, buy tobacco, or to have an ersatz identity. Sometimes fake ID's are for fun to trick ur friends into making u seem important.
1. Gia went to a guy at her school so she could get a fake ID to get into the Razz Jazz Club.
2. I bought my brother a book of fake ID's as a joke to make him seem important
(n.) A false identification, a pseudonym, an alias.
(n.) A card that falsely claims the bearer is older than he or she is to enable priveleges such as alcohol or 'baccy.