1. hitting or striking forcefully
Usage: informal
2. falling asleep suddenly or becoming extremely tired
Usage: informal

Examples

• He was zonking the ball over the fence repeatedly.
• After the long hike, she was zonking out on the couch.
• The pitcher kept zonking fastballs past the batter.
• I’m zonking after staying up all night studying.
• The kids were zonking each other with foam swords.
• By 9 PM, the toddler was zonking in his high chair.