Learn how to say Multi-Tasking correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word multitask:
[no object] (often as noun multitasking)
1(of a person) deal with more than one task at the same time:
parenting skills such as multitasking and concentrating amid distractions are easily transferable to the workplace
2(of a computer) execute more than one program or task simultaneously.