Top Definition
comes from phrase used for a secondary rail route, which branches of the main route. most branch lines are now closed in the UK. to say some one has there own branchline means they're a loner, weird and a bit lost in the head, also can be used in almost any situation possible cause its just funny.
1)John-
''What do you think of Nicole''
Me- ''Awh shes not all ther in the head , she has her own branch line that one'

2)David- Have you seen the television remote?
Me- Havent seen it in weeks id say it has own branch line at this stage!

3) Thomas the tank engine- ''I have my own branch line ''
بواسطة mon bongo ديسمبر/كانون الأَوّل 31, 2009
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