The correct way to spell motherload.

A jackpot, a treasure of great value or abundance.

A motherlode is a vein of of ore or mineral in the earth. If you hit the motherlode you hit the biggest vein with the most of that ore.
"We hit the motherlode!"
by Bob B. Bobertson August 30, 2014
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A very rich seam in a gold mine, a dream or a phantasm !
"his head full of dreams about the mother lode buried somewhere inside" (James Lee Burke, Swan Peak, 2008)
by Dominiqueb59 June 13, 2009
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Clusters of peanuts, dark chocolate and seeds baked in a stream of golden honey and coconut oil; Vein of gold. Origin of something valuable or in great abundance.
"Oh my gosh! I just hit the mother lode!"
by island girls March 23, 2017
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