Things that are slanted have a sharp angle or slope. You might admire the way the morning sun glints against the slanted metal roof of your barn.
A skateboard ramp is slanted, and so is the entire side of an A-frame house. When something is angled in a slant or diagonal, it's slanted. Another meaning of the adjective is "biased," or "one-sided." Slanted news coverage, for example, only gives you one perspective on a controversial subject, rather than the whole picture. The verb slant comes from the sixteenth century word slenten, or "slip sideways."