The flabby fold of fat on the nape of someone's neck, best observed in fat bald sweaty old paps when they tilt their head slightly to look upwards. The phrase "Don't touch it!" derives from the likelihood of an angry response you may get if you feel tempted to give the enticing fold of cervical flab a curious poke. Can in some instances be referred to as double or triple touch to refer to two or three folds of neckfat respectively.
1. The guy buying salmon in front of me at the supermarket had some seriously sexy don't touch it going on.
2. I had a serious temptation to go over and rub chicken grease into the fat triple touch of the wheelchair bound window maker, so I did. Turned out it was gout.
3. "DON'T FUCKIN TOUCH IT BITCH!"