The act of filling a Mazovian Kielbasa with you and your friend's semen and inserting it in your or his girl's vagina, to know who will be the winner in nine months.
Dude, I think my girl is infertile, we can't get pregnant!
Are you down to try the Vistulan Cockthrow to be sure?
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!