"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.
"He sent a gif of a girl about to take her pants off, thats BNSFW"
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.