To put "shit on toast" is an expression used to describe nothing or nothing desirable. Similar to jack shit or if there was indeed a culinary dish with shit or faeces on warm breed it would be considered undesirable by most.

A jack off buddy (from 'cum' /'come', meaning 'semen', and 'companion'); a friend that you get together with for sessions of solo or mutual masturbation
Variant of: cumpanion (from 'companion' & 'cum'); jack off buddy & wank bud & JO buddy
Similar to: fuck buddy

To put "shit on toast" is an expression of how awesome something is. When you really like something - a song, for example - it is your "jam." And what do we do with jam? We put it on toast. As a result, anything awesome is shit put on toast.

When somebody will not leave you alone. Refering to the gravy in Shit on a Shingle ( Creamed Beef on Toast )

Extremely hung over, often with alcohol seeping from pores and a general feeling of repulse.

an over clocked cpu cooled by liquid nitrogen