In the comics, Abomination's height isn't set in stone. Sometimes he's shown to be around 8 to 10 feet tall. It kind of depends on the creative team and the context of the story.
It can walk around in the Lego world. Just like how normal creatures move in our world, the Lego monster can use its Lego legs to stroll through the Lego streets or fields.
Sex toys fanfiction refers to fictional stories created by fans that involve sex toys in some way. It could be part of a romantic or sexual scenario within the fictional world of the story.