A Purring dog is
that one friend who is known for saying the most
unpredictable and/or confusing sentences known to man kind
without warning or fail.
Like a Purring dog, when they open their mouth, it leaves you both stunned and confused.
Group of friends: *chatting*
Dave: “you know,
the north and the
south poles are exactly 1 earth apart from eachother”
The group: *stunned silence*
Steve: “Dave, you are a fucking purring dog.
Or
“Don’t take Dave too seriously, he’s a bit of a purring dog”