Quickmud is like quicksand, but has a noticeably darker, wetter surface - resembling a pool of mud. If one happens to fall into quickmud, they will quickly sink down! One can also sink to various depths in quickmud - and on rare occasions - people can get completely sucked under!
Boy 1: *falls into quickmud, up to his waist* Ah crap! I'm sinking in quickmud!
Boy 2: So what? Everyone knows you can't drown in quicksand.
Boy 1: But this isn't quicksand, it's quickmud!!
*Boy 1 continues to sink, now up to his neck*
Boy 1: No! Help me, please! I'm sinki--!
Mathematics done with a focus on speed of calculation rather than accuracy. This change in priority often results in wild approximations and unvalidated assumptions, leading to low quality answers. Often used in rough-work to check previously calculated answers, or in physics-related pub arguments.
See also, napkinmath.
Red: Quick! How much worse would it be for Venus to crash into the Earth than Mars?
*pause for quickmath*
Blue: Well, Venus has twice the radius, and it's a volume, so... 8. It would be 8 times as bad.
Red: Wow. Science is awesome.