As well as referring to the act of placing the head of an erect penis inside the foreskin/meatus of another erect penis, docking also denotes the act of placing an unerect or flaccid penis along the length of an exposed buttock crack. In this act (often performed in British, public, boarding schools), erections are very much frowned upon.
Eddie bent over, exposing his bumhole with a neatly parted cheek, as Tony docked him expertly. "Oh what a beautiful docking", exclaimed Lara.
Docking is a verb describing the act of stretching one mans foreskin over another mans penis. It can only be practiced between men if one of them is uncircumcised. This "foreplay" is best mixed with a little lube or pre-come prior to the fun begins.
Mitch: Hey I been on such a big dry spell with the ladies can I put my cock in your cocks foreskin?
Al: Docking's the best, no need to ask!
The act of docking is when one male stretches the foreskin of his penis over another mans penis. Docking will result in a more satisfactory orgasm if one or both men ejaculate a bit during or before the act. Too much semen will make it more awkward to move around inside the mans foreskin.
"So johnny, we're going to be docking tonight, right?"