plonker

noun5

1. •
   (slang, disapproving) A fool.

   • “You kept the hat! You bloody plonker!” “Fuck me.” “And now look at you, bouncing off the cars like a bouncing idiot.” “Fucking hell!” “Is he gonna be alright?” — 2020
2. •
   (UK, slang) A penis.
3. •
   (slang) Something bad or inferior.

   • Frank advised him, 'Stay away from cheap songs and the rest will follow.' Bennett did record some plonkers but his overall level of good to bad has to be higher than Frank's. — 2015
4. •
   One who plonks.
5. •
   (slang, old-fashioned) A man who sanctions sexual relationships between his girlfriend and his male friends.