someone who performs utterly ridiculous acts that they think will make them appear cool but in reality make them look like an asshole
After Pam and Kelly did 6 shots and 3 bong rips, they began acting like artars and everyone left the party.
actin a fool; people who call other people artars are mainly doing it so that person can say he/she is not the only artar
1. "That Jamie girl is actin a fool! "
2. "Don't worry, she's an artar too."