1.verbTo project a liquid in a dispersive manner toward something.
"The firemen sprayed the house."
2.verbTo project in a dispersive manner.
"Spray some ointment on that scratch."
3.verbTo project many small items dispersively.
4.verbTo urinate in order to mark territory.
5.verbTo allocate blocks of memory from (a heap, etc.), and fill them with the same byte sequence, hoping to establish that sequence in a certain predetermined location as part of an exploit.