Most often used in online gaming when referring to a person who attacks another without just cause. The person attacks on random and are thus a randomer.
"We've got a randomer here!"
by Alexander Sohlman July 31, 2003
someone who ur not sure whether they r gay or not
if ur best mate is a bit 2 nice
by BABYDUNN October 18, 2003
This was once used as a compliment to a person of how random they can be. In chatrooms often you get a rondomer who will say the most random thing possible to get noticed.
Randomer:I love to cook pie on my dogs fart vapour
by Aiden Lee November 06, 2005