Yep, TOC stands for Table of Contents....so high TOC means a game with a large amount of data on it, filesize-wise.
For whatever reason, if you need to know what games have what size TOC, you can probably google it and find a good list, but I'll help ya out a little
I'm not sure what region you're in, so here are just a few, biggest to smallest:
DVD-9 (Dual-Layer)
8.02GB PAL Champions of Norrath
7.94GB JAP GRAN TURISMO Concept (Traditional Chinese Version) SCPS55903
7.94GB JAP Xenosaga
7.94GB USA God of War 2 (8,533,671,936 bytes)
7.93GB USA God of War (SCUS 97399 - 8,522,792,960 bytes)
7.88GB USA Xenosaga Episode I: Der Wille zur Macht (SLUS 20469 - 8,468,299,776 bytes)
7.80GB PAL God of War 2 (8,383,463,424 bytes)
7.74GB USA Champions of Norrath (SLUS 20565 - 8,319,303,680 bytes)
7.55GB USA The Guy Game (SLUS 21074 - 8,113,094,656 bytes)
7.20GB JAP Sakura Wars Atsuki Chishiyo Ni
DVD-5
4.37GB USA Street Fighter Alpha Anthology
4.37GB PAL TOCA Race Driver 3 (SLES 53087 - 4,697,882,624 bytes)
4.37GB JAP Shin Onimusha - Dawn of Dreams Disc 1 (4,695,162,880)
4.37GB JAP Shin Onimusha - Dawn of Dreams Disc 2 (4,695,162,880)
4.37GB USA Marvel Nemesis: Rise of the Imperfects
4.37GB USA Fifa Street
4.37GB USA Devil May Cry (SLUS 20216 - 4,698,767,360 bytes)
4.37GB USA Resident Evil Outbreak (SLUS 20765 - 4,698,767,360 bytes)
4.37GB USA Sonic Heroes (SLUS 20718 - 4,698,767,360 bytes)
4.37GB PAL SSX On Tour
4.37GB USA FIFA Soccer 2005 (SLUS 21051 - 4,698,734,592 bytes)
4.37GB PAL FIFA 06
4.37GB USA NBA Street V3 (SLUS 21126 - 4,698,701,824 bytes)
4.37GB PAL NBA Street V3
4.37GB USA Star Wars: Battlefront (SLUS 20898 - 4,697,260,032 bytes)