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Macniven 

(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...
Macniven by doctor richtofen July 28, 2011
Related Words
the last name of my cute ass country girl who temporarily lives in Montana bc we fucked and drank but we will always be "children of the lord!!!!!!"
Ragan- McNiven, what a Child of the Lord!
McNiven by Woof Woof Bitch November 1, 2021
Meaning-Monster in the pants
He has a real mcniven.
A girl that is ugly, rude, and stabs people in the back. They are wanna be cool people but, are just everything wrong in a girl. They try to get all trending clothes but, just can’t look good in them and make them look 100x worse. Macnien’s are girls who can’t grow up and are hypocrites. Macnien’s are girls that have pimples on their face, and need proactive.
Macnien’s are fake Snakes.
Macnien's are tall girls who can be rude and sweet at the same time. Macnien's may have a lot of pimples on face, but is still perfect on the inside. Macnien's are very helpful at some times, but she is very open expressing and not afraid to embarrass herself in front of others. Macnien's are very fashionable and stylish. Macnien's can maybe overreact over some things and can cry over sad things. Macnien's can be a bit mischevios and irresponsible at times, but always comes through at the end.

~a girl I can't live without
Macnien is a sweet generous girl who can be rude and nice at the same time.
Macnien by ssolover3 May 5, 2015

machiventa 

An introverted guy that tends to make poor choices, especially when it comes to relationships. He regrets not chosing you.
Thats guy was acting like a total machiventa!
machiventa by machiventa September 19, 2018