Top Definition
A girl who someone dates to get closer to her friend.
With the ultimate goal of dating her friend, you date girl A. When that relationship inevitably fails, you can move onto girl B, whom you have been getting to know throughout the span of the first relationship. Girl A was the step-girlfriend used to get to girl B.
by Chiakara November 07, 2009

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A man who is married to a woman who has a daughter with another man in which he then proceeds to date the daughter of his wife; the step-daughter is now the step-girlfriend.
I told my step-girlfriend to wipe the cock tears from her face before her mother got home.
by Bamzamma August 22, 2015

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt
A woman who dates a man that has children by another woman. The woman is the girlfriend to the father of the children and thus a Step Girlfriend to the children.
The children left their Mom's house to go visit their Dad and Step Girlfriend for the weekend.
by Glitterfly78 December 03, 2009

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt