What is Helsinki Hand Grenade?
1.
when someone is fingering someone elses ass hole and inserts their entire fist and then spreads it out, causing the other person to feel like something exploded inside them like a hand grenade.
That girl made me mad last night so i gave her the helsinki hand grenade.
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Belmont's darkest moment in a decade, in which 95% of the student body went to a dance with a Hawaain theme completely hammered. 1..
