excessive, dissolute, delighted
慆 centers on a state of emotional overflow: excessive indulgence, dissolute behavior, or being carried away with delight. The three given meanings share a core of losing restraint.
慆 combines 忄 (heart/mind) with 舀, which likely contributes the sound. The exact historical development of 舀 is uncertain, but the character likely expressed emotional excess through the heart radical.
The heart radical 忄 beside 舀 suggests a heart overflowing like a vessel being dipped into. Picture emotions spilling over the brim, leading to excessive delight or dissolute behavior.
For タク, imagine a person so dissolute they keep a tacky overflowing heart on display: tacky -> タク, and the heart 忄 is spilling over.