When words like shit and fuck are used, it’s often to express emotion. Meanings of excrement and fornication are less often intended. Both can be vulgarities, obscenities, or profanities, depending on context and who sees or hears it: lawyers, religious people, or your mother.
Shit results from forage, which leads to eating, thus pooping. People who study shit (“excrement examined experimentally”) are called scatologists, although scatology also refers to literature, or they’re called scientists who work in fimo, after the Latin fimus.
Look both ways and watch where you step.
Mind the gaps or you may ruin someone’s idea of a scientific experiment.