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1.
someone who frequently uses aol instant messenger.
fatb0yshawtie23: omg, i' m such an aimer.
by alex February 27, 2004
 
2.
a person who talks so much on AIM that the terms of which transfer over to face to face conversations
"OMG, LOL that's so funny! Wait, G2G TTYL!"
by forgetyou February 09, 2005
 
3.
a person who uses aim all the time.
Mom: what is that program you are ALWAYS on?!
Kid: AIM!!!!<3!!! IM AN AIMER, I WILL ADMIT.
by agsslynaza April 27, 2009