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1. To spill or slosh out of something as a result of being moved around jerkily. He turned around very quickly and soup slopped out of the serving bowl and right onto my expensive suede shoes. Wine slopped out of her glass as she sat back into the sofa.
2. To cause something to spill or slosh out of something else as a result of being moved around jerkily. In this usage, a noun or pronoun is used between "slop" and "out." She stumbled into the wheelbarrow and slopped wet cement out all over the ground. The bumps in the road slopped water out of the buckets suspended from the handlebars of my bicycle.
3. To serve some liquid or messy food in a very fast, indelicate way. In this usage, a noun or pronoun can be used between "slop" and "out." I have to go slop out food at the local homeless shelter as part of my community service. Hey, don't slop the soup out like that—you're splashing it all over the tablecloth!
slop out (of something)
[for a liquid] to spill or splash out of a container. some of the orange juice slopped out of the container, making a mess on the table. some milk slopped out. Please clean it up.