Best definition
Woobler is a word-variable that can be used in substitute for any word with in a sentence.

I hate that woobler.

That woobler is amazing.

Oh crap that hit my woobler.

Look at that woobler.
Woobler: define #2
a new slang word commonly used among teens in the south-east england referring to a bong.

a bong is a tubular device, often made of plastic, used to inhale large amounts of marijuana
‘ryan blad, im gonna have to hoot another woobler’