"BNSFW" (Borderline Not Safe For Work) is a term used to describe content that may be considered inappropriate or offensive in some settings, but not explicitly graphic or explicit.
BNSF is the not so epic railroad that came out when the awesome BN and EPIC AT&SF merged. BNSF is liked because of them being nice to railfans, and for not completely wiping out fallen flags, like UP does with their the piss-colored "Armor" scheme, but is hated because of them insistently buying widecab locomotives from the suckfest company we like to call GE.