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1.
when a person consumes so much alcohol they gain marshmallow like qualities such as limpness of the body and penis, mellow attitude and tendency's to become weak in warm surroundings leading to vomiting and releasing of the bowls causing stickyness.
girl 1: how did things go after the club last night?
girl 2: i got him into bed and he marshmallowed on me.

or

guy 1: i was so drunk last night
guy 2: you were totally marshmallowed
by mmmmdaly January 18, 2012