keysmash

[kee-smash]

noun

a random string of letters and symbols typed out on a keyboard or touchscreen, used to signal intense emotion in written communication:The photo of the actor was accompanied by a heartfelt keysmash.
the action of typing out such a random string of letters or symbols: Keysmash was the only appropriate response.

verb (used without object)

to use keysmashes to signal intense emotion in written communication:I was so excited I couldn’t stop keysmashing.

Origin of keysmash

1995–2000; key¹ (on a computer) + smash