What with something
Definition 1 of 1
Pro Tip 1/3Emphasis Geared
The phrase adds emphasis to the reasons behind a situation or feeling. 
She's overwhelmed, what with studying for exams and working full-time.
Pro Tip 2/3Multipurpose Connector
Connects multiple causes, explaining more than one reason for an event or action. 
He couldn't come, what with the traffic jam and his car troubles.
Pro Tip 3/3Informal Tone
Used in casual conversations rather than formal writing or speeches. 
I didn't finish the book, what with all the interruptions today.