Something that forcibly
imposes itself on you at a time when
you don't want it.
Example: Facebook Messenger's extremely annoying popup notification that superimposes itself over everything else you are doing on your smart phone
and has to be uninstalled in order to stop it.
I installed Facebook
Messenger on my smart phone because
I was forced into it with Zuckerberg's monopoly on social media and all, but I decided I would rather swallow
glass than have to endure the annoying app -- and uninstalled
it within 12 hours because
it was so damn intrusive.