noun. In an office setting, it's when one normal hard-working co-worker gets a lecture/story from a rude, annoying co-worker (usually named Dan) about something that is completely unimportant and irrelevant to the normal co-worker, and the lecture or story is most commonly about something that has already been heard by everyone numerous times.
It can take anywhere from a couple of minutes to a half-hour to finish a Dantini, but the effects won't wear off for days in some cases. It is not uncommon to get multiple Dantini's in one day. Dantini's can be received in person, over the phone, secondhand, or even via e-mail. Dantini's can be received as a group or as an individual.
I just got my second Dantini of the day, and I'm not feeling very good. Can you take my keys and give me a ride home?