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The act of a male from the back woods grabbing their sister and performing anal sex with her against her will. Once its over, he does not clean off his penis, but instead spanks it on her forehead to leave brown bomb like marks while yelling "YEEE HAAWWW"
Billy bob: Hey Cledus, I done heard ya hillbilly bombed yur sister last night!

Cledus: Yep, sure did! I yelled "Hillbilly bomb incoming! Hide your keester!" It was F I N E fine fine fine!

Bill bob: Woo wee Cledus, I will make sure to corner my sister tonight!
by boltious January 12, 2011
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