Grom the Paunch

Gobbos are cowardly and disloyal, but nothing stirs their wicked hearts like Grom, mightiest of Goblin Warbosses. Stories of Grom's greatness still command attention around any Goblin camp and if a Shaman should conjure his superlative-sized image, even the most boisterous gobbo will behave with reverence. In Grom's looming presence Goblins will stand up straight, refrain from grumbling backtalk and even limit their rampant nose-picking. These ultimate displays of respect are because, to lowly Goblins, Grom is a living god, the embodiment of everything that they will never be -- large, ferocious and idolised.

It was not always so. Grom's meteoric rise began when, as a young Boss of the Broken Axe tribe, he consumed a portion of raw Troll. As Troll flesh regenerates and Grom, always a big eater, had not stopped to cook the meal, the foul meat writhed in his belly. The race to regrow, against the race to digest, was on. A lesser Goblin would have burst asunder, but Grom was made of sterner stuff. The Battle of the Belly, as the deed came to be known, changed Grom. He grew to prodigious size. It is said that on that day Grom last saw his own legs. Yet so huge and powerful had Grom grown that he no longer needed to see them, and could, instead, order others to see his legs for him.

So Grom's legend began. He quickly rose to be Warlord of the Broken Axe tribe and they spent many happy years plundering the Wolf Lands, the Badlands and the southern World's Edge Mountain. By this time, Grom had taken to fighting atop a chariot, as it suited his grandiose proportions. Many Goblins travelled far to see 'da Great 'Un' and join his exploits and, at its peak, Grom's Waaagh! contained hundreds of different tribes. Grom carved his name large in the psyches of Men, Dwarfs and Elves, in whose realms he is still feared and cursed. Even now, rumours sweep the Badlands that his corpulent majesty has returned and his once again amassing an army to launch a new invasion...

Source

 * Warhammer Armies: Orcs & Goblins (8th Edition) -- pg. 67