The urban definition of 'butter' is to have refined skills at a particular task, like playing basketball for example. To further understand the meaning of the word, you have to grasp a general idea of where the usage of it came from. Originally, people of all backgrounds used to say the phrase "I'm on a roll!" meaning that at the moment, they were so good at doing something, that there was no stopping them. Later on, people took the phrase to the next level by saying "I'm must be butter, 'cause I'm on a roll!" in the sense that, if you're on a roll, you have to butter, because that's what most people put on rolls. Later, this was just shortened to "Butter!"
(After draining a fourth straight three-pointer): I MUST be butter, 'cause I'm on a roll!
some other guy: um, uh...yeah.
some other guy: um, uh...yeah.
by blah May 23, 2004
 Get the buttermug.
Get the buttermug. by stop it loser April 15, 2009
 Get the Buttermug.
Get the Buttermug. by Idunno September 14, 2003
 Get the buttersmug.
Get the buttersmug. by Rupie November 3, 2008
 Get the buttermug.
Get the buttermug. Northern Slang Word for a basic Tan Pair of Timberlands brand boots; usually used in Philly,Wilmington DE & South Jersey.
by Monn November 30, 2009
 Get the Buttersmug.
Get the Buttersmug. by SlangForDays April 5, 2021
 Get the Buttersmug.
Get the Buttersmug. 