I haven't read the entire thread yet, so sorry if I'm repeating.
"Buy the farm." WW1 I believe - he bought the farm. If you go over the top you'll buy the farm. My understanding soldiers were always going to buy a farm when they returned home. But more died than returned home, so buying the farm is a euphemism for dying. See: kick the bucket.
"Gone for a toss." Indian colloquialism, doesn't mean what you may assume it does

From cricket.
BOGU - I've heard used at Microsoft. bend over, grease up. Same as Bohica.