Bouncing off the walls and generally being annoyingly effervescent. You know--like Tigger.
He's so Tiggerish that it drives everyone crazy. If he'd stay still long enough, I'd slap him silly.
by OG-BB1966 October 30, 2014
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After deputy prime minister Dominic Raab's use of the term to describe Boris Johnson (currently UK Prime Minister) and thereby exculpate him from any blame for an appalling speech he made to the UK's Confederation of British Industry, the term was defined in The Guardian by Ishowerdaily in this way:

"Tiggerish"

Expecting an entry in the Urban Dictionary now with the definition being "disrespectful and wankerish display of, what may or may not be contrived, ignorance."

QED

The name had previously been applied to disgraced former Health Secretary Matt Hancock.
He said the prime minister was “focused on the job at hand”, and was an “ebullient, bouncy, optimistic, Tiggerish character and he livens up his speeches in a way that few politicians past and present have done, but actually there is a steeliness to him as a prime minister and indeed his team, and we work as a team.”
by Rural Lexicologist November 24, 2021
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