“Talking off the top of my head”
Root expressions:

“Talking out of my ass”
“off the top of my head”



Comments:
This could also be "Speaking off the cuff" and "off the top of my head." Incidentally I have overheard things like "It's on the tip of my head."
Matt Barber, 2/27/10
Overheard. Not so strong but at least partially conflated
Scott Worthington, 2/26/10



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