This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
舙 is a rare character composed of three 舌 (tongue) components. The exact historical development is uncertain, but it likely relates to speech or scheming, given the tongue repetition.
Three tongues stacked together suggest excessive talking or scheming, but the exact meaning is unclear.
For カン, imagine a can of tongues spilling out as someone schemes: can -> カン, and the three tongues 舙 chatter inside.