NSF - Not Safe For:
W - Work
M - Me
MM/MB - My Mind/My Brain
KOTB - Kids On The Board/Block
100% of guessing.
(
JustHere4Coffee remembers when all o' this were car parks,
Sat 10 May 2003, 20:28,
archived)
and, of course,
MC - Matthew Corbett
(
djol,
Sat 10 May 2003, 20:44,
archived)