Someone who claims to have made an item they just found or bought and will sometimes try to sell it to you for much more then it was actually worth.
Bill is such a FMer, he said he made that shirt and would sell it to me when I saw him buy it at the store
by asd allnib November 17, 2016
An FMer is somebody who claims something that they didn't make. They are usually used in games like ROBLOX Script Builders.
by Tigerloverpro January 13, 2017