Derived from the word 'Yurt' which is a mongolian tent. Can be built using the following: a fold out bed, quilts, brooms/mops/metal poles, sellotape.
Once constructed (if constructed properly) you should have a tent which can stand the test of time (or just the night)which you can cotch in with up to three people. Smoking inside of the Yerg is NOT recommended.
'We need somewhere to cotch'
'Its gonna have to be a Yerg then'