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Your great-gran.
The children went to visit their mumumum.
Mumumum by SomeoneNew September 17, 2012
“Hey John! That mumpus was delicious”.

“Did you get that surgery yet, Adam?”

“No bro, my mumpus is falling off”.
mumpus by Mumpussauce March 29, 2021
"mumbums here"
"YAAAAAAY!"
mumbum by chloemayy June 8, 2009
Mumum went to the store yesterday for her granddaughter.
mumum by Dr ariana February 25, 2018

Mississippi Mudpump 

A sex act
Give a women laxatives, and then when they kick in proceed with anal intercourse so that she spurts "mud"
Read definition and then apply the Mississippi Mudpump.
Mississippi Mudpump by Satyricon October 16, 2006

Mexican Mudpumping 

A sexual act involving 2 men: whereas man A gives plethora laxatives to man B (a mexican lad) to get his insides nice and juicy. Man A proceeds to swizzle straw the juicy nectar from man B's anus. Heretofore - pumping mud from a Mexican.
I haven't talked to Panda in a while.

Friend: Yeah, Panda got a new lover named Diego, and they've been Mexican Mudpumping for 2 days straight.