"Margaret thatcher the cum snatcher" is a nickname or term you give to someone who is always vigorously horny and craving sex for the pure enjoyment of seman.
Joe: I just had sex with Bianca.
Nick: why she's always trying to be "Margaret thatcher the cum snatcher."
Joe: true but I heard shell do anything for sex.
Nick: but still she "Margaret thatcher the cum snatcher."
a WOMAN and only a WOMAN that consistently trys to get whatever she can from a man
clothes, money, weed, food , hair did , nails did, cigs, beer, etc.
BITCH GET A JOB!
jenny: "can yu please buy me food just this once i promise il pay yu back?"
derek:" Go get a job with yo ol crumsnatching ass bitch, fuckin crumsnatchers"