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4.
k9
A shortened form of the word "Canine."
The sound of the word results in "K-9."
"That dog is a cute K9!"
by Dalhusky July 23, 2006
 
1.
K9
Rear-entry sexual intercourse; e.g. "doggie-style"
by Anonymous October 15, 2003
 
2.
K9
The police unit that uses dogs to sniff for drugs or other things
Man, i'm lucky i wasn't pulled over by the k9 unit while smuggling this crack
by Giant-rat June 30, 2005
 
3.
K9
sex between humans and dogs.
'she is into k9'
~how much do you love your k9~
by wolfgirl November 04, 2003
 
5.
K9
Robotic dog from Doctor Who.
I wish I had a nose laser like K9.
by neitherday October 31, 2006
 
6.
K-9
A dog police force that is meant to sniff out drugs, and bad guys. They know how to attack and send their opponent on the ground bleeding and crying and eventually die if there were not their handlers to arrest them and let them bleed out as they give them a ticket for fleeing the law and going 5 MPH over the speed limit in a 80 km/h zone.

But sometimes if your luck they will shoot you before they let the hounds loose on you. Just like Mr. Burns from the Simpsons who always lets the hounds loose on trespassers like Girl scouts and orphans!
Example 1:
Mark: Why you running
Kevin: Cause the K-9's are after me
Mark: You better run they bit off Matt's balls last week!

Example 2:
Burns: Release the hounds!
Smithers: Their out for cleaning
Burns: Well you go get them then!
Smithers: Right away, Sir! Bark!
by Diablohell October 15, 2008
 
7.
K-9
sex with dogs
she has k-9 all the time.
by dancesinggirl6 April 07, 2010