When someone defecates grub size pieces of fecal matter into another persons tub. Similar to an upper decker, but more visibly noticeable. The fecal matter resembles a grub, slowly on its way down the reservoir that is the bath tub drain.
Dude, I totally left a tub grub in my roommate's bathroom. He's going to be so pissed if he ever finds out it's mine.
by DoppleGanger14 June 18, 2011
by atticus g May 01, 2019
Ian: Hey Alice, you wanna go skinny tubbing with me? you know you do
Alice: Go fuck yourself *slaps*
Alice: Go fuck yourself *slaps*
by moonzeppelin October 23, 2008
The act of two or more males spending an evening in a hot tub or jacuzzi together without any female counterparts present.
by ZackyPants January 10, 2011
by Haryazz December 10, 2003
"He's a fat tub of lard."
by Bowman June 16, 2002
by j branch August 14, 2006