A person who is tiny or has a tiny body, but has a big head and/or fluffy,spikey or crazy hairdo. They resemble a muffin, because muffins have a tiny bottom part with a huge fluffy top part, just with alot more stuff on them than a muffin. may be used as a degrading term for a short or tiny person.
person A: LOL THAT PERSONS HEAD IS DISPROPORTIONAL TO HIS BODY! WHAT A MUFFINSTUFF
person B: HAHAH YEAH! HIS HEAD IS TOO BIG AND HIS HAIR IS SO FLUFFY! LIKE A MUFFINSTUFF
person C: HEY YOU! CAN I CALL YOU MUFFINSTUFF??
person D: AWW, POOR LITTLE MUFFINSTUFF CANT REACH THE TOP SHELF?
Muffinstuffin is the act where a female sneaks her panties off and while thee unsuspecting male or female is talking away the muffinstuffer takes her opportunity to pounce upon her prey stuffing her vagina in her unsuspecting preys mouth thus stufffin her muffin.
Did you see that muffinstffin that Rachael did to myke.He clearly diddent see that muffinstuffin coming,she stuffed her muffin clean down his throat!
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi