noun, from Finnish, meaning "limp", a 'lerppu' is the name for a floppy disk, but it is usually associated with penises, so a lerppu or lerppu kyrpa would be someone who has a limp penis.
"Dude, you threw away my homework? You lerppu!"
It can be used to talk about penises, like after a long date, the man and woman finally get somewhere, and the man is devoid of an erection; he has a lerppu.
by lerppu June 16, 2004
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A "Soft Cock",

A person who who cannot consumate.
A very poor effort or attempt.

Derived from FINNISH words meaning exactly FLOPPY DICK / penus.
Example a sales guy makes the deal, but the factory screws up on the delivery.

Like flirting all night to get a lady into bed, then producing a flacid member, at the crucial moment.
You fakking Lerppu kyrpa!

Your effort was fakking lerppu kyrpa!

That was Lerppu Kyrpa.
by PJ December 4, 2003
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