goose

Jennifer WeinerのFly Away Homeを読んでいます。
She put her book back in her purse and opened the car door. Her voice was calm and her hands were steady. “Hello, Richard,” she called.
He spun around as if she’d goosed him, his new boots tangling briefly on the pavement so that he almost tripped, and Sylvie was reminded so vividly of their first meeting, when he’d fallen through the ice, that tears sprang to her eyes.
動詞の "goosed" の意味は何でしょうか？
・Oxford English Dictionary:
1. Poke (someone) between the buttocks.: He winked at one of the girls and goosed one of the boys.
2. Give (something) a boost; invigorate; increase.: the director goosed up the star's grosses by making him funny
・Webster’s New World College Dictionary: to prod suddenly and playfully in the backside so as to startle
・Cambridge English Dictionary:
1. to press or take hold of someone's bottom
2. to encourage or cause something or someone to be more active
ほとんどの辞書にこの二つの意味が書かれています。小説の個所はその前に "as if" があるので、あたかもお尻をつっついたかの様にと解釈して良さそうです。