To be of an inordinately immaturenature. To speak chatroom acronyms out loud. To copy things that are not yours, and get pissed whenever someone copies you.
"Ell Oh Ell"
"Dude.. stop being Digm."
"Double-you Tee Eff!"
"I said stop!"
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"giggy"
"yup... giggy"
"hey.. stop copying me! Only I am DIGM!"