1) Besotted 2) Blotto 3) Covered 4) Crocked 5) Drunk 6) Fuddled 7) Groomed 8) In a cast 9) Inebriated 10) Intoxicated 11) Lit 12) Looped 13) Pie-eyed 14) Slicked 15) Slopped 16) Sloshed 17) Sotted 18) Soused 19) Sozzled 20) Squiffy 21) Stewed 22) Stinking 23) Stinko 24) Stoned 25) Threesheetstothe 26) Tiddley 1) Daubed 2) Did wall work 3) Groomed 4) Patched a ceiling 5) Slang for drunk 6) Slicked 7) Slang for drunk, intoxicated 8) Very drunk 
• (imp. & p. p.) of Plaster
Plastered is slang for drunk, intoxicated.
[adj] - (of hair) made smooth by applying a sticky or glossy substance 2. [adj] - (of walls) covered with a coat of plaster
Drunk (Scottish slang). Example: Getting plastered on whisky.
slicked adjective (of hair) made smooth by applying a sticky or glossy substance; `black hair plastered with pomade`
Another word for loaded. In other words you have had rather too much to drink down your local. It has nothing to do with being covered with plaster though anything is possible when you are plastered.