Multi-tasking

A polite way of telling someone you haven't heard a word they said. Commonly used on long conference calls, when the speaker is monotonous, boring, or couldn't make a point of one were drawn for them.

Joe: Blah, blah corporate office blah, blah, leverage proactively blah, blah human capital and grade-A synergy, blah, blah. Do you agree, Jim?
Jim: I'm sorry, Joe, I was multitasking, can you repeat that?