It’s basically continuation of “ur mum gay”which is used by few cus they don’t know what it means
Carl:your mum gay

Garl:no you
Karl:your dad lesbian
Garl:your granny tranny
Karl:*kills himself*
by >Joshy< March 13, 2018
If someone says ur granny tranny there is truly no comebacc, not even ur grandpap a trap

Only one thing is more powerful than "ur granny tranny". Be careful how u use that power.
That sentence is "ur tranny granny". So u call ur enemy gay/tranny lover and and an alabamian and his/her granny tranny
Bruce: ur granny tranny
Lee: ur tranny granny
Bruce: *dead, eaten and fucked by furries*
by Urgranagranhahaxd March 16, 2018
Old Men(perferably over 50) engaged in sexual activity dressed up as Old Lady's
I was totally into that old lady till I found out she was a granny tranny
by Surg June 1, 2006
A transmission with a low gear (granny gear), usually used on trucks and other towing vehicles, to make it easy to take off on a hill with a heavy load.
This truck has a granny tranny so it's easy to learn how to drive stick shift with it.
by Eaglescout1984 January 15, 2009
an old man who in his photo or in person appears to be female, and folks who don't know the subject cannot determine his gender.
Dude, when I saw your photo online I thought you were a woman!!! You granny tranny!!!
by dusano December 11, 2008
When your nan gets a cock sewed on to her.
Man, your nan has a big bulge! does she use a cushion for her fanny pad? No, she has no fanny, she's a granny-tranny!
by Bill the Fish August 14, 2006