An Australian colloquialism; describing someone intellectually impaired or moronic.
In the case of this phrase, the term "roo" is an abbreviation for kangaroo, an Australian marsupial.

Used emphatically, the phrase is sometimes amended to "a few roos loose in the top paddock".

To have a roo loose in the top paddock:

After John spent all those years on weed, he talked liked he had a roo loose in the top paddock.
by MrKapper July 10, 2006
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tap-tap-tap-a-roo

v.imp. An encouragement or admonishment to tap something, whether in the common sexual usage (i.e. tap dat, "Tap that ass", et cetera) or in the ironic non-sexual usage which refers to the sexual usage. Taken from the Adam Sandler movie *Happy Gilmour*, where Sandler's character is trying to tap or putt a golf ball.
Sexual usage:
"Jimmy asked me out and I don't know what to say"
"He's hot! Tap-tap-tap-a-roo!"

Ironic usage:
"Ooh, perogies are on sale! ap-tap-tap-a-roo!"
by Sarah Keebs August 04, 2005
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When you take a clandestine hit of marijuana and blow the smoke/vapor into your winter knit cap, aka toque.
"So how was the movie?
"It was long, but...Coo-Roo-Coo-Coo-Coo-Coo-Coo-Coo"
by Mr Yellovich December 02, 2019
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Roo Bear

A cute little female bear that loves to eat honey, salmon and apples. She is very cute and cuddly and known to bite you or paw you in an endearing manner. Roo Bears are definitely keepers.
Sorry I can't drink tonight fellas. I have to go home and let my Roo Bear bite my arm.
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Roo's Rear Eater

Somone who considers eating a kangaroo's ring piece (or cock)more acceptable than eating its tongue.
Did you hear Steve say that he wouldnt mind eating a Kangaroos arse? - or even its cock? Yeah hes a real Roo's Rear Eater is that mister Fletcher!!!

Normal people wouldnt do either.
by UK Greg November 23, 2006
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roo wrangler

Holy fuck mate, that roo wrangler drank Bob under the table!
by Howie_Phelterbush July 06, 2017
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pet my roo

Bob: Pet my roo
Lisa: *proceeds to fondle his penis
by Austin2400 February 06, 2017
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