noun. A most blessed motherfucker.
Related terms: motherhumper, motherjumper, motherfunker, motherflipper, motherflunker, motherfreaker, motherfouler, motherpumper, mothergrabber, motherhugger, motherjiver, mothersucker, mothermucker, motherpucker, motherfuckingfucker.
[Telly] What'chu say? [Grover] What's wrong? Didn't think I'd remember?
[Bert] We will find that motherblesser! [Zoe] Uhhh-aahh! Temper temper!
Elmo's world? Where's that stupid dumb girl?
Mr. Ernie coming straight out of southtown y'all give him a twirl
(Tokusou Sentai Blessranger, "Guilty Conscience," http://www.amiright.com/parody/90s/eminem32.shtml)
Made-up citation: "If one more motherblesser says 'Have a blessed day' to me, I will be forced to smile and respond: 'Go bless yourself! With a hockey stick!'"