The term "Throw that pigskin nephew" is a running gag inside the Counter-Strike HvH community, popularised by the youtuber Noob Dog, aka Boring or Boring Channel.

The joke is said to encourage others to buy decoys, an in-game item, and then throw them. Teammates will be able to make the player that threw the decoy receive a cooldown due to the item being able to damage other players. If the player damages his or her teammates too much, by, for example, hurting too many people with a decoy, will result in a cooldown for the player.
"Let's get some decoys"
*Somebody buys one*
"Throw that pigskin nephew"
by pickle_chin May 21, 2019