Opposite of multitasker, a singletasker is
one who only takes upon
one task at a
time, and follows it through to completion. Often used sardonically when someone is bragging about their supreme multitasking skills.
Bobby: "Today I'
m only going to focus on finishing my TPS reports and not to answer the
phone, email, text, IM, staple, and make breakfast simultaneously."
Jeffy: "You are such the singletasker!"
Bobby: "I can't even respond to you at this
time, because then I'd be multitasking."