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plonk1
[transitive always + adverb/preposition] especially British English informal
[transitive always + adverb/preposition] especially British English informal1 also plonk something down to put something down somewhere, especially in a noisy and careless way [= plunk American English] 
You can plonk those bags down anywhere in my room.
You can plonk those bags down anywhere in my room.2 to sit down heavily and then relax : We plonked ourselves down in front of the telly and opened a couple of beers.
plonk yourself (down)
We plonked ourselves down in front of the telly and opened a couple of beers.