Grottery 

Storage facility of pornographic material

Brian had recently extended his grottery to 16 TB.

Grottery by Mykeyboy April 5, 2011

Grotter 

Someone sexually unattractive, with dirty toes and orifices, found near the Civic Centre, Dagenham.

One wouldn't want to give the offender the pleasure of being named.

Grotter by Bungle December 2, 2003

Grotter 

Someone who burps loudly in their girlfriends face, whilst they are snuggled together face to face in bed.

Oh Christopher you're such a grotter!

Grotter by Long suffering girlfriend October 29, 2017