buttinski n.

"hit with the head, strike by thrusting" (as with the end of a beam or thick stick), c. 1200, from Anglo-French buter, Old French boter "push, shove, knock; thrust against," from Frankish or another Germanic source (compare Old Norse bauta, Low German boten "to strike, beat"), from Proto-Germanic *butan, from PIE root *bhau- "to strike."

The meaning "join at the end, be contiguous" is from 1660s, partly a shortening of abut. To butt in "rudely intrude" is American English slang, attested from 1900. Related: Butted; butting.

principal city of the Netherlands; the name is a reference to the dam (see dam (n.1)) built on the Amstel river. The river name is said to be from Germanic elements ama "current" and stelle "place." Prevalence of dam in Dutch place names (Rotterdam, Edam, etc.) reflects the geography of Holland. In rhyming slang, "ram" (e.g. for one who "butts in" a queue).