look up any word, like blumpkin:
 
1.
a love letter, particularly a hot and steamy one. The future of mash notes is endangered by the internet.
He felt waves of jealousy when he discovered the mash notes to his wife from an old flame written twenty years ago before they were married.
by Mandingoe October 09, 2004
 
2.
a flattering letter or note offering or proposing sex
I'm tired of those mash notes she sends.
by The Return of Light Joker February 06, 2009