1 definition by doctor richtofen

Top Definition
(mac-niv-on)
a word used to describe the act of fingering ones bum hole during sex/masterbation. They may not be fingering there own bum hole, it may be another party i.e a girl or gay partner
That man looks like he macniven's himself.

he asked me to macniven him...
by doctor richtofen July 27, 2011

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