To impose unwanted responsibility upon; to nag or harass someone, especially to do something they don't want to do. To harsh someone. Can also be used as a noun to indicate someone who engages in the act of "monting."
"My boss wants me to do all this work before the end of the day.. he's really monting me" or "My mom won't stop yelling at me; she's being a real mont."
A tedious, arduous, or seemingly interminable task; often used to refer to a task imposed upon one by a person who is a "mont." Note that "mont" can also be used for other forms of nouns besides persons, such as objects that make a task unnecessarily difficult, and places that are unchill or difficult to reach.