an expression used to signify something that is good, fun or otherwise pleasing.
purported to have originated in the portsmouth (or pompy) area of southeast england.
"that rave last night was lakes mush"
A gentleman or lady who is not of sound mind, generally used either in jest or in reference to a short temper.
About a person: "Alan? He's lakes! I saw him flaking two knackers the other night!"