From SPN anon meme
Soulfisting refers to an act in episode 6.07 Family Matters where Castiel put his fist into Sam's chest to search for his soul. It has since become a meme on meme.
- Sam dreams of soulfisting: Top/bottom, June 14, 2012, Post #82
- Soulfisting and soulcum: Set photos 10/5/12, October 6, Post #89
- Sassy and Cas/Benny soulfisting: 8.5 spoilers, October 9, 2012, Post #89
- Dean gets in on soulfisting Sam, plus Cas giving advice: Wincest mentioned in this article, October 21, Post #90
- Sassy soulfisting: 8.7 description, October 24, 2012, Post #91