Definition
To firmly commit to (something or someone).
To involve (a person or thing) in (a plan or system) in such a way that escaping from it is difficult.
How People Actually Use It
If you make a controversial statement, it is best you have the evidence to support it.
"Mark: I'm thinking of telling Evgeny that Communism is overrated *shocked faces* Adam: Mate, if you throw a shit into the room, you better be able to lock the door!"
Source: Urban Dictionary