fungineering 

like engineering or reverse-engineering, but based on creativity and fun instead of science

i fungineered up this new shape, i call it the octhedratron

fungineering by the world's greatest May 1, 2005

Flangineering 

In gaming terms creating a character with ridiculous stats, abilities, kit, perks etc. Usually with the express purpose of breaking game balance and/or reducing the GM to a gibbering wreak.

Min/Maxing can be said to be crude stat based flangineering often employed by munchkins.

GM: Yeah he took the gift Blade of Heimdall just so he could stab a Black Spiral to death with a silver toothpick....f**king flangineering bastard!!

Flangineering by Big Bald Ian April 16, 2009

Frengineering

French engineering. Something which should have been designed and built to acceptable standards, but instead has been developed by frengineers.

Jay: Shall we build this like in the instructions?

Bob: Nah, lets do some frengineering.

Frengineering by Physignathus October 21, 2010