Oh, ‘wanker’. Possibly the best British insult on the list, it fits a certain niche for a single-worded insult to lobbied out in a moment of frustration, anger, provocation, or, of course, as a jest amongst friends. ‘Wanker’ fits the closest fit by ‘jerk’ or ‘asshole’, but to a slightly higher value.

For example, ‘That guy just cut me up in traffic – what a wanker.’