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."