Yiddish: He's riding on two horses.

He's indecisive.  He won't choose one side or the other.  He wants it both ways.
SOURCE: Stutchkoff, Der Oytser fun der Yidisher Shprakh.  Compare:

He's sitting on two chairs.  |  Er zitst af tsvey shtuln.  |  ‎.‎ער זיצט אויף צוויי שטולן

SOURCE: Stutchkoff, Der Oytser fun der Yidisher Shprakh

Mit eyn hintn zitst men nit af tsvey ferd.  |  ‎מיט אײן הינטן זיצט מען ניט אױף צװײ פֿערד‫.‬
You can't sit on two horses with one behind.

SOURCE: Kumove, Words Like Arrows

ער רײַט אויף צוויי פֿערד.

Er rayt af tsvey ferd.

He's riding on two horses.

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