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1) to laugh so much that your dick gets hard
2) to get a hard-on or erection from a dirty or kinky joke
Acronym: LYDH
Pete: This joke will really Laugh Your Dick Hard.
Pete: How do rednecks tell if a girl is old enough to marry?
Joe: I don't know.
Pete: Stand her in a barrel. If her head is above the rim, she's old enough. If it isn't above the rim, cut the barrel down a little.
by galen_gris October 26, 2011
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