No, that would be mrgoat. (Spelling it "merkans" would alleviate some of the misunderstandings about pubic wigs, BTW)
Actually, it was several people. Unfortunately, a link to an external site listed an erroneous definition saying it was derogatory (it's not) and that there was a connection to the wig thing (there's not).
Also, GWB never called anyone a Merkan, he called than American, but to anyone over here, that's what it sounded like.
I know it's not derogatory, because I used the phrase myself before I had heard it used elsewhere (I'm not claiming originality, just independent invention) and I made no connection to the wigs, nor was it used in a derogatory fashion.