a jocular name for one who cuts into a line, etc., 1902, American English, from verbal phrase butt in (see butt (v.)) + surname ending based on Eastern European names. Butt-in (n.) "person who butts in" is attested from 1906. Compare Amsterdam.
butternut
butterscotch
buttery
butthead
butthole
buttinski
buttock
buttocks
button
button-hole
buttonwood
)window.location='https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=byronic106@yahoo.com&lc=US&item_name=Donation+to +Help+Keep+Etymonline+Free+and+Open&no_note=0&cn=&curency_code=USD&bn=PP-DonationsBF:btn_donateCC_LG.gif:NonHosted'){kind=link}