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When you curl up into a fetal position during intercourse, and prevent your partner from reaching your genitals.
"Yo man, last night I pulled the old Fetus Lock on my girlfriend, and now she thinks I need to see a counsellor "
by BellBoy August 20, 2014
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Aug 11 Word of the Day
You can tell by the way she walks, she got that WAP.

You can look at her face and tell she ain't got that WAP.
by Black Don August 06, 2020
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2
When you curl up into a fetal position during intercourse, and prevent your parter from reaching your genitals.
"Yo man, last night I pulled the old Fetus Lock on my girlfriend, and now she thinks I need to see a counsellor "
by BellBoy August 20, 2014
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Get a Fetus Lock mug for your cat GΓΌnter.