köten

/køten/

Cases

SingularPluralWhen to use it
nominativekötenthe backsidekötenlethe backsidesthe plain dictionary form — the doer of the sentence
genitivekötennithe backside'skötenlenithe backsides'the owner — whose it is
accusativekötennithe backside (as the object)kötenlenithe backsides (as the object)a specific, known object — whom or what
dativekötengeto the backsidekötenlegeto the backsidesdirection or recipient — to where, to whom
locativekötendeat / in the backsidekötenledeat / in the backsideswhere it is; also having — mende bar, "I have it"
ablativekötendenfrom the backsidekötenledenfrom the backsideswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
mykötenimmy backsidekötenlerimmy backsides
yourköteningyour backsidekötenleringyour backsides
his / herkötenihis / her backsidekötenlerihis / her backsides
ourkötenibizour backsidekötenleribizour backsides
you all'skötenigizyou all's backsidekötenlerigizyou all's backsides
theirkötenleritheir backsidekötenleritheir backsides

The overlap in the last rows is real, not a mistake: kötenleri can mean "his / her backsides", "their backside", or "their backsides" — context decides.