spit 1 
(spĭt)
(spĭt)n.
1. Saliva, especially when expectorated; spittle.
2. The act of expectorating.
3. Something, such as the frothy secretion of spittle bugs, that resembles spit.
4. A brief, scattered rainfall or snowfall.
5. Informal The perfect likeness: He's the spit and image of his father.
v. spat (spăt) or spit, spit·ting, spits
v.tr.
1. To eject from the mouth: spat out the grape seeds.
2. To eject as if from the mouth: a fire spitting sparks.
3. To emit suddenly and forcefully: spat out an insult.
v.intr.
Phrasal Verb: 1. To eject matter from the mouth; expectorate.
2. To express contempt or animosity, especially by ejecting matter from the mouth.
3. To make a hissing or sputtering noise: french fries spitting in the pan.
4. To rain or snow in light, scattered drops or flakes.
spit up
To vomit. Used especially of a baby.
[Middle English, from spitten, to spit, from Old English spittan, ultimately of imitative origin.]