Started with Dan Dinh, a high ELO player of League of Legends, where he drank wine and got drunk while playing, yet still beat other players. Afterwards, people complained about him being too strong and drunk, or "stronk".
The feeling of being caressed by a duckling's wet feet. As duckling feet are wet, and slimy, being stronked might cause you to create several typos and stare at people for long periods of time, without blinking.