jack in the slat
to completely bonk your girlfriend and then dump your whole load right on her privates. it’s like you’re saying ‘i’m not done yet’ and you’re basically giving her a free slat massage.
he jacked her in the slat so hard she cried and then laughed because it was so funny.
i told my mom i was going to jack her in the slat and she said ‘you better not come home with a broken nose.’
my girlfriend said she’d let me jack her in the slat if i promised to never mention it again.