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1. noun A hard or sharp blow or strike; a thwack. She gave him a swack to the head when he leaned in for a kiss. Back in my day, teachers wouldn't hesitate giving unruly students a swack on the hands.
2. verb To deliver a hard or sharp blow or strike to someone or something; to thwack someone or something. I don't like the way he swacks his dog on the nose for peeing in the house, but it's not my place to tell him how to train the thing. Swacking the computer like that isn't going to make it work any better.
slang Drunk. You spent the whole night getting swacked on cheap vodka, so I'm not surprised you woke up with a splitting headache. We were all too swacked to drive, so I had to call my husband to come pick us up from the restaurant.
mod. alcohol intoxicated. He walked straight out of the office and went straight into the bar with the intention of getting swacked.