The "big daddy" coffee mug is back.

Oklahoma State football coach Mike Gundy's Twitter account posted a video of the coach wearing an orange wrestling singlet to promote Sunday's home wrestling dual, where No. 1 OSU will host No. 2 Penn State.

Both programs have undefeated seasons thus far.

"We need a butt in every seat to make Gallagher the rowdiest arena in the country," Gundy says in the video.

The dual will be 3 p.m. Sunday at GIA.

"We need you to be there, be loud, and go Pokes," Gundy says.

View the video below:

No. 1 #okstate wrestles No. 2 Penn State in a HUGE matchup in Gallagher-Iba Arena Sunday. Don't miss it! Tickets: https://t.co/jEx5nG6ezI pic.twitter.com/L057voXE0W — Mike Gundy (@CoachGundy) February 15, 2017