Dull as ......

[Yardbent]

As opposed to 'Biscuit, Brown' from compo rations... Usually referred to as sh!t stoppers.

which nicely leads me to the origin of the 'poop deck'

 

[Blank_Canvas]

which nicely leads me to the origin of the 'poop deck'

Ahh, that's a an easy one but not to be confused with the quarterdeck ( or flight deck even ) in RN Parlance !

 

[Bobsyeruncle]

You two must be doing it wrong!.........and I'm guessing not together before anyone starts

I always thought it was dishwater

Dull as f**k does not mean f*****g is dull