A grandchild of one's grandparent's first cousin.

(anthropology) The child of one's father's brother or of one's mother's sister; a cousin related via same-gender siblings rather than opposite-gender ones (the latter being a cross-cousin).

The child of a maternal uncle or of a paternal aunt

A child of one's mother's sibling / A more distant relative of one's mother who is not a direct ancestor

A child of one's father's sibling / A more distant relative of one's father who is not a direct ancestor

The child of one's parent's half-sibling.

Any of a number of people who have a common great-great-great-great-great-grandparent.

cousinfucker

plural of cousin humper

Any of a number of people who have a common great-great-great-great-grandparent.