From Middle Dutch or Middle Low German begecken (“to deride”), equivalent to be- + geck. More at geek.
begeck (third-person singular simple present begecks, present participle begecking, simple past and past participle begecked)
- (transitive, Britain dialectal) To deceive; disappoint; jilt.
begeck (plural begecks)
- (transitive, Britain dialectal) A disappointment; trick.