nosey parker, intermeddler, pragmatic, interloper, participate, kibitzer, intruder, meddler, busybody, interferer, quidnunc.
" You're making a heap of formality out of this, Mr. Buttinsky,"
sneered the cowpuncher.
" I'd give a ripe peach to learn the identity of the scheming buttinsky
who bought old Cardigan's Valley of the Giants," he said presently.
No use trying to make a deal, with this old man of the sea out playin' buttinsky."