1.
 
Yammies refer to extremely large breasts on a woman.
After Michelle kicks the ball, her yammies make it to first base about a minute before the rest of her.
See breasts, boobs, knockers, hooters, tits, chesticles, breasticles, hangers, flapjacks, jugs, fun bags, sweater puppies, ta-tas, rack, whoppers, yams, tetons, torpedoes, sweater meat, pumpkins, melons, mountains, mams, headlights, dueling banjos, floatation devices, mammoths
2.
 
The chest of a fat male that resembles a woman's breasts. AKA manboobs
Look at Sam's yammies! They jiggle when he runs!!
See manboobs, bitchtits, estrogen, overweight, fat