A Bujjar Kurehat is the 5 sins in sikhi in which a sikh should never commit. Adultery is the one that the people were refering to.
The 5 Bujjar Kurehatan are:
-Adultery
-Consuming alcohol
-Kesan Dey Beadbi, disrespect to our hair (inevitably meaning cutting it, and in the eyes of more stricter rehitvaan sikhs doing anything disrespectful to you hair cutting, getting highlights, dying, etc..)
-Consuming meat
-Taking intoxicants
Bul Chuk Maaf