A Scottish term meaning 'hooligan' or 'trouble-maker'.
Other descriptions here mention 'stupid person' or 'clumsy idiot'. I wouldn't use bampot in either of those senses but, instead, go for 'fanny' and 'pleb' respectively.
Police sergeant- What does he look like?
Rose- He looks distinguished
Onslow -He looks like a barmpot.
Police sergeant- Can you narrow that down a bit? Does he have any distinguishing features?
Onslow -He was carrying a bucket and spade. Daisy- He was going to the seaside.
Police sergeant- With his bucket and spade....
Onslow- I told you, barmpot
Brought to public attention by Bob Woodward and Carl Bernstein in the book on the fall of Richard Nixon, All The President’s Men, ratfucker was Nixon’s term for a political operative who sows chaos among opponents; an agent provocateur. It is thought to have originated among campus political rivalries at USC, and seems to have some usage in the US military.
Along with Nixon’s other ratfuckers, Roger Stone caused fights at otherwise peaceful Democratic Party protests to generate a false narrative that the Democrats were violent and dangerous.