A term used for the random smashing of letters on the keyboard by a person to express incoherent delight or frustration over something.
#1: Hey, here's the fic I promised you. ^^
#2: ASDFDKGHKDFJGHDFKH <3333
#1: My computer died on me, so I won't be able to write you that fic I promised you. D;
#2: ASDFKJGHSDJGHSDKG DDDD;
"asdfkdgjhdfkgh" --> is keysmashery, not necessarily those same letters, but random letters all the same.
#1: So keysmashery needs practice? :o
#2: Of course! Anyone can keysmash, but can they do it while still making their keysmashery look pretty?
#1: OH. THEN MUST PRACTICE MORE. ;D