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Has no precise meaning, but can be used in ANY situation. Often used when speaker cannot think of a verb to describe a person; it is only used in reference to people, so can be utilized as a noun. The positive or negative connotation of the word is dictated by the situation and tone.

It is most well known by the Biology students of Swansea University.
"Shut up, you bumperlark"

"Stop with the compliments you bumperlark"

"Nigel Farage is such a fucking bumperlark!"
by sutmaebec May 27, 2014
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