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1.
the muffin effect is used to describe the massive overhang of fat when ones jeans or pants stc are way to tight.

this look resembles the way a muffin explodes over the edge of its little paper holder.
oh my god,look at the muffin effect on that bitch! her pants look like they belong to a 12 year old with anorexia!
by Jasmin January 27, 2005
 
2.
when a person has become so fat their pants can no longer hold in their fat, hence making them look like a muffin
Guy1- damn did u see that chick at the party
Guy2- ya that muffin effect was fucking sick
by hahaha me November 28, 2008