What does exactly mean 'to plant oneself somewhere'?
On MacMillan dictionary we read:
to firmly put someone or something or yourself in a particular place or position. Plant something in/on etc something:
"Henry planted himself in the seat next to me."
But what emotion does this action convey specifically? What could be the reason for Henry to plant—rather than just seat—himself in the seat? Does the word, in this case, suggest that Henry was tired, angry, or that he wanted to make sure that no one else would steal that seat?