baby buggy

Concise Oxford English Dictionary © 2008 Oxford University Press:
buggy1

▶noun (pl. buggies)

• 1 a small motor vehicle with an open top.

• 2 (also baby buggy) a light collapsible pushchair.

• 3 historical a light horse-drawn vehicle for one or two people.

– origin C18: of unknown origin.

Concise Oxford English Dictionary © 2008 Oxford University Press:
buggy2

▶adjective (buggier, buggiest)

• 1 infested with bugs.

• 2 N. Amer. informal mad.