1 definition by grip100692

Top Definition
when something virtually unheard of or unused becomes heard of and the norm.
relevant, common, known

Twitter is now mainstreamhood b/c of Russell brand
by grip100692 January 29, 2009
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.