Refers to the use of the app Yik Yak, which is basically anonymous twitter confined to a certain area; used mainly by students. Also a pun on jacking off.

A portmanteau of carpe diem, a Latin phrase that means “Seize the Day!” and DM, which stands for Direct Messages. This word means seizing the day via DMs.

1) - Talking on and on and on without saying much of anything of substance.
2) - Spending way too much time telling people how wonderful you are
Other versions: "Yak Off" and/or "Yakked Off"

Spending countless hours on the social media app "Yik Yak". Much like jacking off, it can be an extremely pleasurable activity.