Green’s Dictionary of Slang

begerk n.

[elision of SE big jerk v.2 (7) or jerk n.1 (2)]

(Aus.) an act of male masturbation, thus a despicable figure.

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[Aus]‘Thommo’ Dict. Aus. Swearing & Sex Sayings 15: BEGERK — Male masturbation, an oil rig saying for a big jerk.