By Getting in My Rhyme Book!!!

Before there was Drake, there was Aubrey Graham -- who was hard at work putting pen to paper before he ever blew up as a rapper ... and now you can buy his old flows for tens of thousands.

A notebook owned by Drizzy between 2002 and 2005 is going up for sale through the memorabilia company Moments in Time -- and they're hawking this treasure for a hefty price tag of $32,500.

The notebook was found in a dumpster near Drake's grandpa's old furniture factory in Toronto, where Drake used to work. It also features his signature, so this thing's legit.

The price might sound steep, but trust us ... there's good content in here that's worth every penny. We're told this particular notebook features 20-25 pages of verses, full songs, and random musings by the hip-hop legend during his 'Degrassi' days.

In fact, there are tons of insights into how a young Champagne Papi viewed and dealt with women in those days. It's got lyrics like ...

Girls lie and you make it evident you affected

Up north / Drake is the president I’m respected

But I’m a liar due to the evidence you collected

From chicks in my crew / to chicks beside you

Cashiers at the drive through / them hoes lie too