The act of taking a hammer to cement; hammering cement or other hard surfaces; the only way to release the emotions in which there are no words to describe.
My dreams were starting to come true but my parents oppressed my opportunities, so I took my hammer and dondered their driveway.
Scotland was finally in my life so I dondered out of pure joy;
Dandere, oftenly confused with kuudere, is a common anime trope used to describe people who are often quiet and extremely shy towards people they like. Despite this, once they do start to conversate (usually awkwardly) with the one they admire, they become more open and less shy.
The reason this is confused with the definition kuudere is because both tropes hardly talk, and occasionally show their more open side. A kuudere is someone who is often emotionless and clueless, but will sometimes show their loving and kind/sympathetic side.
A character that is a dandere: Hinata Hyuga from Naruto.
A character that is a kuudere, not a dandere: Kanade Tachibana from Angel Beats!
dude: "ahahaa, *insert name here* is such a dandere. she hardly talks but she's for some reason really nice and open to me. rarely, though."