an expression used to add emphasis to something, much like an exclamation point.
Example #1
A: Landon's coming?

B: You don't like him?

A: I fucking hate him in a halfshell.

Example #2
I'd totally do her in a halfshell.
by Chiggers Dudley May 27, 2008
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a concrete statue of the virgin mary which is backed by a shell shaped form. Frequently seen on the front lawns of the faithful.In this incarnation she looks disturbingly like something found in shellfish. Frequently the shell shaped back is painted light .blue to make the statue stand out more
Look at all these our lady on the halfshell's!! This must be an italian neighborhood.
by slipsheet December 31, 2005
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