1. Male sexual excitement. Becoming sexually aroused to the point of penile erection. Growing a boner
or hard on
2. Growing characteristically tougher. Referring to the hardening of one’s character usually brought on by great hardship.
3. Becoming difficult.
1. “Whenever Sarah gives me that look, she know's I'm getting hard”
2. “These final exams keep getting me down. I’m getting so hard I don’t give a shit anymore”
3. “It’s getting hard to tolerate your Mum’s dutch oven