When one singularly fails to achieve what they set out to do when commencing a conversation, much to the disappointment of their peers. A failure to either glean or pass on any information during the course of a conversation.
You just tonked that conversation. You just exchanged niceties for ten minutes. Phone them back and actually find out what time we're meeting.
The courtesy honk you give a driver in front of you at a stoplight who isn't moving because he/she is distracted by texting or checking email
That guy isn't moving, give him a tonk; The jerk was checking his email so I tonked him to get him going; check out the tonker in front of us; you need to tonk him so we can get moving