In using the same idea as MoFo, or "mother fucker," LoMo is short for "Lover from another mother." It is found in Northern California, primarily in Sacramento, and sometimes in the San Francisco area, also known as the "Yay" Area.
LoMo does not imply incest in anyway, but is in fact a compliment.
Friend 1: "What are you doing tonight?"
Friend 2: "Ah, ya kno braa, just hanging out with my LoMo."
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