A really tall skinny upper-middle class white 8th grader who acts like a 40 year old man and is a borderline narcissist that you've known since grade one and have always hated only to befriend them briefly in grade 7 and then start to hate again in grade 8 along with everyone else in your class and proceed to hate for the rest of middle and high school.
Liams also have a tendency to befriend your 4th grade friends and turn them into mushy brain zombies, and are ALWAYS homophobic, sexist, transphobic, and racist.
Person 1 "Did you hear about the dude who lied about his height"
Person 2: "yeah, first he was 5'9, then 5'8, then 5'10, and now he's saying he's 5,11. It's been 3 months."
Person 3: "Oh him? He must be a Liam."