Quotes Beerfest

UK quotes from the movie Beerfest, what do they mean?
In the movie "Beerfest", what do these quotes. "You're all for a coat and pants do not be." Shove off! We'll put on your Whickers Alan skitters that plonker! "
Not sure at first but the second is rhyming slang for example apple and pears = stairs. china plate = mate. So would Alan Whickers panties. So we're going to scare and plonker you are an idiot.
Das Boot!!!