Acronym for "been there, done that, got the t-shirt."

Means you have already done the thing suggested, either to the point of mastery or disgust.
"Wow! That roller coaster looks pretty scary."

"bt, dt, gtts." /puffs out chest/

OR

"Hey, you should totally go out with Anders. He's pretty hot."

"No way. bt, dt, gtts. He's an old fart."
by radagastor February 9, 2011
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