Immediately after peeing in the snow, one rams his unchub in the pee hole in the snow. After the phallus is sufficiently frozen and frost bitten, the actor pulls one off. Simplicity is key.
"Hey man, how'd your night go? It was so cold out!"
"This girl rejected me, so I had some terrible blue balls. To relieve the situation, I had an old fashioned Yukon Understatement to set me right."
"Right on, brother."
"Not really. The tip is still frozen."