This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 揬 is uncertain. It visually combines 扌 (hand) with 突, but the original component relationship is unclear.
The hand radical 扌 beside 突 suggests an action involving thrusting or poking, but the exact meaning is unclear.
For トツ, imagine a hand thrusting forward with a sharp 'tots' sound: tots -> トツ, like a sudden poke.