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The Collaborative International Dictionary of English v.0.48 (gcide)

Slogan \Slo"gan\, n. [Gael. sluagh-ghairm, i.e., an army cry;
sluagh army gairm a call, calling.]
The war cry, or gathering word, of a Highland clan in
Scotland. --Sir W. Scott.
[1913 Webster]

2. Hence: A distinctive motto, phrase, or cry used by any
person or party to express a purpose or ideal; a
catchphrase; a rallying cry.
[PJC]