A widely popular phrase of abbreviated words to sound almost nothing like the original meaning:
1) A large (Massive) group gathering (Session) of people with the Y chromosome (Peen); Hanging out; Chillin with the bros.
2) Mass Peen Sesh can also refer either to Gay/homosexual intercourse between many men.
Dude, friday we're having a Mass Peen Sesh at joe's for some mad ish.
Mass Peen Sesh at Cinema 10 on Saturday, you comin' bro?
"Okay so likkkeeee were havvingg some mass peen sesh at my houseeeee ;) come with ur toyzzzz!"
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When a penis is so small that it resembles the pinky of a human hand
"How was sex last night?"
"I couldn't even feel it, he had a pinky peen"
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The act of inserting the claw end of a hammer into your lovers anus, and then furiously yanking upward, thus mimicking the fresh churning of butter in the mid 19th century.
Paul was getting the Paul-Peen Hammer from David when things got out of hand, and a window was broken when the hammer slipped out of David's hands.
Someone who takes bollocks and penis at the same time in their mouth
Man: omg my girl is such a bollock peen lord
Friend: wdym?
Man: bro she swallowed the dick and the balls fam
A group of fuckboys, who have tiny peens and waddle because they have churned butter. Scarier than big boi gang
That big peen gang is scarier than my asshole after Taco Bell
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One's natural reaction to slaughtering an enemy balloon in the skies of Guns of Icarus by the wrath of WARPIG.
We trolled that fucker so hard, my e-peen is huge.
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