Poke/stick your nose into something
Definition 1 of 1
Pro Tip 1/3Negative Connotation
Using this phrase often implies disapproval and can suggest the person is being nosy or prying. 
She always pokes her nose into our conversations, which is quite annoying.
Pro Tip 2/3Informal Use
The phrase is casual and used more in spoken language or informal writing, like friendly emails or messages. 
I didn't mean to poke my nose into your issues; I was just trying to help.
Pro Tip 3/3Cultural Perception
Some cultures view this phrase as rude, so know your audience before using it. 
In some workplace cultures, poking your nose into others' work is frowned upon.