Grabbing someone's entire breast and twisting heartilly. Similar to purple nurple, but using the whole breast. Also similar to indian sunburn, but usually a one-handed assault. Most effective on B or C cup sizes. A's are too small to grab and D's or larger usually have more surface area to allow for differential expansion.
There is the rare double purple tit twister, but carrying school books in one arm usually shields at least one mammary gland.
Quite common among younger adolescents or pre-teens when one or two classmates suddenly show up with C-cups after summer break.
Heee heeee. Tina grew some big ones, man! Let's wait around the corner and give her a purple tit twister when she comes around!