This isn’t much of a joke, but here's a pickup line. Are you a marshmallow? Because I wanna put my stick in you.
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Explanation
Explain Bear
Listen up, buttercup. The 'stick' is a euphemism for the male reproductive organ. The joke suggests the person wants to engage in sexual activity with the other person, using the marshmallow and stick imagery as a vulgar innuendo. You probably ask your mom where babies come from. Sad!