'Don't you know what you mean to him'. It's a phrase from HYYH The Notes. Yoonkookers (and sometimes non-Yoonkookers) use it to hurt each other's feelings on Twitter.
Yoonkooker 1: DYKWYMTH?
Yoonkooker 2: *quietly breaks down into tears*
Pronounced 'dah-will'. Glaswegian slang for poorly-written, tabloidesque-syle, cliched prose. Style of writing typically seen in down-market Scottish broadsheets.
Man alive! That Bawwy's autobiography's pure dawwyl, by the way.
Dawwyl, you are a rank.
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.