dinnae lippen

of scottish origin, fameous in the song "The Birkin Tree".

Means: dont trust/count on it

Oh lad, my haun' I canna gi'e
But aiblins I man steal the key
And I'll meet ye at yon birkin tree
That grows doon in the glen O
But dinnae lippen, laddie
I canna promise, laddie
Oh dinnae lippen, laddie
In case I canna win O