A keyboard spam is when someone smashes
random letters on their keyboard, whether it be via mobile, desktop, or otherwise. Most of the time, keyboard spams have no literal connotation, they're just... Well, spams.
Someone could keyboard spam for various reasons. I, personally, keyboard spam when one of my friends says something that makes my brain go "alkajskahsuejsbsjd." But you could also spam out of
frustration, excitement, speechlessness,
embarrassment, or just pure boredom.
Keyboard spams can be followed by or placed after sentences (coherent or not), or just by themselves.
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Keyboard spam example:
Flustered*
Friend 1: "Thanks, Darling. :)"
Friend 2: "akhekshrkegjevrj WHAG DID YOU JUST CALL ME"
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Keyboard spam example: Boredom*
Friend 1: "I'm bored.
Friend 2: "kssjebsjshdje"
Friend 1: "Same bro, same."