i swear on me nans grave - A ridiculous oath used by people who can’t tell the truth an

A ridiculous oath used by people who can’t tell the truth and probably have no idea who their nan is.

I swear on me nans grave I didn’t leave the mess in the kitchen.

I swear on me nans grave I didn’t forget my homework.

I swear on me nans grave I didn’t tell the whole class about your crush.