I’ll give you some mumps before I split some lump sum’s with you

from T.I. (Ft. Eminem) – That's All She Wrote (Alternate Eminem Verse) Lyrics on Rap Genius

Meaning

Mumps is a contagious disease that leads to painful swelling of the salivary glands.

To split some lump sum’s he means splitting his cash-flow. “To have large lump sums of money surrounding you at all times

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