It means to smile broadly, especially in an unrestrained manner and with the mouth open.
A grin is a wide smile that shows the teeth. A giggle is a quiet laugh.If you use the phrase "We just did it for grins and giggles" then obviously you did it so that you would grin and giggle, or have fun.
A grin is when you smile widely and bare your teeth.
Started smiling, probably used like "Cracked a smile", when the person "cracking a grin" smiles, even though you wouldn't expect it.
It just means they smiled. Perhaps they were trying to hold back a smile, but they grinned nonetheless.
White Paper
A grin is a wide smile that shows the teeth. A giggle is a quiet laugh.If you use the phrase "We just did it for grins and giggles" then obviously you did it so that you would grin and giggle, or have fun.
A grin is when you smile widely and bare your teeth.
Grin means to smile happily
Great big grin
The term "mean long grin" is not commonly used or recognized. It is likely a made-up phrase or a specific term used in a certain context or community. Without further information, it is difficult to provide a specific meaning for this phrase.
gypsum or plaster.
=D is a cheesy grin :)
In texting, g or <g> means "grin".
Plaster of Paris is non-toxic, but that doesn't mean it is safe for kids to consume. If your child ate plaster of Paris call poison control.
It means to be totally drunk or crazy
Started smiling, probably used like "Cracked a smile", when the person "cracking a grin" smiles, even though you wouldn't expect it.
The big grin emoticon is simply ":D" so it may mean he is happy. The Emoticons are used in almost every Yahoo Conversation so probably nothing.