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2.
I have seen many explanations of this, but here I will explain how it works:
A chav girl has sex with her chav brother, who is also her father which is not uncommon. They produce a chav child, which will biologically be both her brother and her son. At the age of about 8, the chav child will have sex with it's chav mother afore mentioned 'chav girl', producing another child to which the previous chav child will be brother, uncle, and dad.
chav: im gona see ma da tonight.
chav#: e's ur uncle too rite?
chav: yeah an my bro. e's my bruncledad.
by cait h June 22, 2007
 
1.
Originated on a certain anti-chav site, used to describe the odd relationship apparently inbred chavs have with other (male) members of their family. (SEE Jug Ears. ALL chavs have jug-ears.)

Probably obviously, it derives from brother, uncle, and dad, and it has been quoted as "merely being uncle dad with 2 extra letters".

No-one, as of yet, has managed to figure out how a person might become brother, uncle, and father all to the same person.

A suitably humourous female counterpart has yet to be coined.
That chavette only has a dummy in her mouth to keep in all the spooge she drained from her bruncledad's nutsack.
by THE A-C M September 20, 2006
 
3.
Derogatory term used in reference to inbred families or communities, usually chav related.

To actually be a Bruncledad you would have to have been born from a woman who had slept with her dad. You would then be her brother and her son. Then you would have to sleep with her and you'd be a bruncledad to the kid from that. Youd be the kids brother because his mother gave birth to you. Youd be his uncle because her dad is your father, and so youre her brother. And you'd be the kids dad.
Whats up with that 6-toed bruncledad?
by The Cultured Evil Genius June 16, 2007
 
4.
Originated on the site ChavScum.co.uk, used to describe the odd relationship allegedly inbred chavs have with other (male) members of their family.

Probably obviously, it derives from brother, uncle, and dad, and it has been quoted as "merely being uncle dad with 2 extra letters".

No-one, as of yet, has managed to figure out how a person might become brother, uncle, and father all to the same person.

A suitably humourous female counterpart has yet to be coined.
That chavette only has a dummy in her mouth to keep in all the spooge she drained from her bruncledad's nutsack.
by ACM September 14, 2006