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1.
Propane tanks placed in the central hallway with C-4 used to ignite it, creates a fuel air explosive – Used for bringing down a house when contact is made inside. Named by 2nd squad, 1st platoon, I Company.
The marines decided to pull out and leave a house guest after heavy resistance was met on the second floor.
by Aaron Linville March 14, 2005
 
2.
One leaves one's shit (or someone / something else's) in the reservoir of the toilet. The owner will smell it for some time before finding the floating crap, if ever found.
When we went to that guy's party he was a total jerk, so I left him a house guest.
by drocto September 13, 2006