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1.
A great ass. You put your ear to it and you can hear the ocean.
KJ's ass is like a conch shell, put your ear to it and you can hear the ocean
by CHRHSLC May 26, 2009
 
2.
Giving a girl a rimjob while fingering her.
Man, Johnny really has a thing for "Lord of the Flies". He tried to play Debbie's asshole like a conch shell.
by Zachary G. October 22, 2007
 
3.
right after you have sex doggy with a girl, you scream in her ass and hear an echo
yesterday my girlfriends conch shell was so loud, the neighbors heard it
by michael/mclovin October 24, 2007