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3.
when a man goes to get a vasectomy.
My friend had a manbortion so he could copulate freely with random plus pieces around the world.
 
1.
When one man finishes being the "catcher" in an act of anal sex and goes directly to the toilet to flush away his butt-babies.
Before Danny takes his turn humping Robby, he must first get rid of that, "Oh so full feeling". Danny takes a seat on the toilet and gives himself a man-bortion. Pooping out Robby's love nectar.
by Dr. DonkeySock March 11, 2006
 
2.
The act of going for a huge manly shit after a rather heavy night out, usually comprising Beer, Spirits and Takeaway food (most likely containing Chilli or spice of some kind). The closest a male can get to the feeling of having something living forcibly torn out of them. Coined by a group of lads from Shrewsbury, Shropshire, UK.
Lad, i think i need to go for a Manbortion!

Dude i just went for one hell of a Manbortion!

Ah fuck it smells like someone's just had a Manbortion in there! Manbort! MANBORT!
by Captain Jesus Pasty August 17, 2010
 
4.
The loss of manly things from ones life when a female becomes involved with ones life
I got a Manbortion after my girlfriend moved in with me.
by THEDarkKITTEN October 26, 2009