Top Definition
A process that occurs as women age. When women are young their curiosity is fixated on the bulge in the front of a man's trousers. As they age they become much less concerned with this and their curiosity is placed in the size of the bulge in the man's rear pocket. So, women look for the bulge to migrate front to back as they age.
The MILF bypassed the hansome young man with ripped abs, and gravitated toward the man with the expensive watch and designer suit, even though he was butt ugly, 75 pounds over weight, and was 20 years her senior. The young mans' self assurance was shattered by a classic case of bulge migration.
by Lone Wolf Jax November 11, 2011

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