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
Get the Fetus Lock mug.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
Get the Fetus Lock mug.