Toby Keith said of Obama in 2009:
I'm giving our commander in chief a chance before I start grabbing. So far, I'm cool with it."
It appears on Toby Keith's Wikipedia page and originally apparently came from a Politico article.
What does the verb "grab" mean in this context? It does sound like to grasp.
Edit:
Courtesy of godel9, the original interview is available in video here.