"Showing off" or going out of one's way to appear spectacular. See showboating.
"After jumping the grand canyon on a unicycle, Harry was grandstanding by cycling backwards with his eyes closed with his underpants on fire."
by BigPimpDaddy May 07, 2004
Showing off.
I don't think Phil realizes he's grandstanding in his speedo. Chicks dig his little tight ass.
by y20degrees May 07, 2004
To perform , show off.

Look at dude over there grand standing tryna impress allison. pshhhh
by Justin Kane October 14, 2008
To receive fellatio while defecating in the upper tank of a toilet instead of the bowl.
"John keeps talking about how he got a lumpkin AND upper decked somebody the other night."

"Nah, he was just grandstanding - "
by HCGATOR07 December 03, 2009
Brilliant persons of an upstanding community. Usually with huge bottoms.
Council chairpersons
by daniel ives May 07, 2004

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