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1.
Who is trying threaten me?
A: Your dead, give in.

B: You and what army.
by The Return of Light Joker November 28, 2009
 
2.
A phrase that responds to a threat by implying that the threat is a weak one.
Billy: Our team is going to slaughter your team.
Nick: Yeah? You and what army?
by Fr3nch fr13s June 11, 2014