千摺り: masturbation (male)

a tattoo (an image made in the skin with ink and a needle) / a punishment in which a criminals were given a tattoo as a mark of their criminal record

Alternative form of 積もる

initial (first, placed at the beginning) / initial (first letter of a word or name); initials (the first letter of each word of one's name in romaji or a European script as a unit)