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1.
To use the toilet.
I've got to go to the bathroom to lavitate.
by chikinymer March 07, 2004
 
2.
The act of not exactly sitting, but not exactly standing over a LONGDROP, but more a case of just bending the knees with your bum a few inches above the seat when wanting to defecate
The longdrop was somewhat very dirty, so I had to lavitate while trying to have a crap.
by Gadget King January 19, 2011