The art of casually browsing through your phone in a group of people rather than take part in the conversation. To ignore those you are with to Grom your phone.
When a young male finishes in his hand and uses his splooge to fill all the wrinkles on a GILF's face.
Bjorn was adventurous in the tile industry and became bored one day during his lunch break. He went to his friend Nemo's house where his grandmother was sleeping and decided to play with himself. Bjorn finished in his hand and found himself (grouting) Nemo's GILF of a grandmother while she was sleeping.
When a female has a six pack, and your cum on her chest. The cum then fills into the ab lines achieving a grouting affect.
I was banging this chick from cross-fit and I ended up grouting tile because I didn't want a baby with a chick who has a six pack, because girls with six packs are gross.