The feminine of cock block.
When a woman purpposely tries to prevent another woman from getting laid, usually with the explicit intention of leaving the sexual target vulnerable to her own sexual advances.
"we met this really hot guy with scorching dreadlocks and I cunt shunted the fuck out my mate for 2 days trying to get into his pants"
"I really like this woman but she was being chatted up by someone else so I went for the sureptitious cunt shunt and ended up in her bed all weekend"