To cum inside a female's box during unprotected sex.
Jack, did you use a condom last night with Sally?

Nah, she let me boxcum inside her pussy. Says she loves the smooth feel of a bare dick.
by LoMy September 22, 2017
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Cumming inside a pussy during unprotected sex
Jason, why don't you like to use rubbers?

Because I **LOVE** boxcumming!!!
by LoMy September 22, 2017
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