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1.
A game of tag played with (but not necessarily within) dreams; player no. 1 dreams about another person -- player no. 2 -- and then that player dreams about the same person again, or another person.

Much like fridge tag, but in dreams.
tag
"Hey Maxx! I had a dream about you last night. Dream tag, you're it!"
by Kael Asmodeus November 26, 2011