tweaking own nipple
Pinching ones own nipples and rolling the tips between ones own fingers as if tuning the dial of a radio.
If the nipple-tweaker is also pulling on the nipple, it can be tagged nipple pull as well.
Use nipple rub if the person is "caressing" the nipple instead of pinching it.
See also
This tag implicates nipple_tweak (learn more).
