When someone goes to the bathroom, finds a log that is hard, and places that log into a condom. They then place the filled condom in the freezer and once it is hard, use it as a dildo.
Two people/animals put each others assholes together as if their assholes are kissing, then one proceeds to shit from their asshole into the other asshole without breaking the pipeline and letting shit fall out onto the floor.
Leroy and Lafonda performed the trans-alaskan pipeline because Lafona was anorexic and never had to shit, so she wanted to borrow some of Leroy's.
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!