pullin' a Dan
The act of (accidentally or otherwise) committing to plans with two separate groups of people at the same time, likely resulting in a poor attempt to 'do both'.
"Where's Rosalie tonight? She said she was coming to the party?"
"Ahh, she's pullin' a Dan at another party with her other friends, she'll show up later tonight"
"Ahh, she's pullin' a Dan at another party with her other friends, she'll show up later tonight"