licentious, libertine, dissipate
泆 centers on unchecked excess, especially in personal behavior: being licentious, libertine, or dissipating one's energy and resources without restraint.
泆 combines 氵 (water) with 失, which likely contributes the sound and the idea of losing control or overflowing. The exact historical development is uncertain.
Water 氵 on the left and 失 (lose) on the right: imagine a flood of water causing loss of restraint, leading to licentious and dissipated behavior.
For イツ, picture a libertine who eats too much and gets the hiccups: 'itsu' sounds like 'hiccup' in a loose way, and the excess leads to dissipation.