Wibbly wobbly, timey wimey

"A big ball of wibbly wobbly, timey wimey stuff" was how the Tenth Doctor described time to Sally Sparrow through a DVD Easter Egg. Though he quickly admitted that the sentence had "got[ten] away from [him]", the term was soon therefter applied to an invention of his, the timey-wimey detector. (TV: Blink) Though it was seemingly his tenth incarnation who coined it, the Fifth Doctor was familiar enough with the expression to complete the phrase when the Tenth Doctor started it. (TV: Time Crash)

The Doctor began using "wibbly wobbly, timey wimey" and variations with higher frequency following his regeneration into the Eleventh Doctor. (TV: The Eleventh Hour, The Doctor, the Widow and the Wardrobe, The Angels Take Manhattan) The term lent itself to two other devices during this incarnation: the wibbly lever and the timey-wimey distress beacon. (TV: The Wedding of River Song, Time)

When the Eleventh Doctor used it in front of the War Doctor, the Tenth Doctor claimed to "[not know] where he gets that from". The War Doctor ridiculed his successors, asking why they insisted on talking like children. (TV: The Day of the Doctor)