I'm ham - Telling someone you're not just okay with the plan, you're i

Telling someone you're not just okay with the plan, you're in it for the long haul.

'I'm ham for this trip.', said after agreeing to go on a road trip with three friends and no plans.

'I'm ham for this mess.', said before jumping into a pile of confetti.

'I'm ham for this journey.', said after being asked to walk a mile in socks.