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1.
butt cleavage. something you say to friends when they are showing some, err, crack.
Luke: Katie, steveage!!
Katie: Oh, thanks! That could have been a disaster!
by LukethMcKinney January 18, 2008
 
2.
When a man with man boobs has a cleavage.
Bren: "That guy is fat as fuck"
Jim: "Yeah he's got a proper steveage"
by ScrapInTown January 25, 2012