This seems like a mix of a character name (), a seasonal theme ( summer heat ), a possible artist/series reference ( Skuddbutt ), and a state ( WIP = work in progress, hot = trending or intense).
Not in a romantic sense—Skuddbutt is a 3D model glitch. But the community found the absurdity “hot” as in popular . At its peak, #SkuddbuttSummer had 12k posts on Tumblr, most of them GIFs of the clippy tail spinning at 60 FPS while Gwen fans herself. gwen summer heat all wip skuddbutt hot