Bold & Brash is a painting created by Squidward Tentacles, The Neighbor of Spongebob Squarepants and cashier of the popular sea-restaurant The Krusty Krab. Bold & Brash (used in this context) means to stick out, beauty.
This name was (most likely) chosen for a rhyme to make fun of his art. Which his art is not bad, at all.
Squidward: Bold and Brash!
Fish: Bold and Brash? More like...Belongs in the Trash!
The love/obsession of algebra/math.
Person 1: "I'm alegesexual"
Person 2: "I hate algebra."